Which sentence option correctly uses a colon

A. When Ariana goes shopping, there is only one thing to do: plan to spend the whole day at the mall.

Explanation:

Use a colon to introduce an item or a series of items. Do not capitalize the first item after the colon (unless it's a proper noun). A capital letter generally does not introduce a word, phrase, or incomplete sentence following a colon. Avoid using a colon before a list if it directly follows a verb or preposition that would ordinarily need no punctuation in that sentence. When listing items one by one, one per line, following a colon, capitalization and ending punctuation are optional when using single words or phrases preceded by letters, numbers, or bullet points. If each point is a complete sentence, capitalize the first word and end the sentence with appropriate ending punctuation. Otherwise, there are no hard and fast rules, except be consistent. A colon instead of a semicolon may be used between independent clauses when the second sentence explains, illustrates, paraphrases, or expands on the first sentence. Capitalize the first word of a complete or full-sentence quotation that follows a colon. The colon lists what needs to be done. Basically, the sentence is stating that when Ariana goes shopping, the only thing to do is: spend the whole day in the mall. Do you understand what a colon is? A colon is a punctuation mark (:) used to precede a list of items, a quotation, or an expansion or explanation. A colon used in various technical and formulaic contexts, for example a statement of proportion between two numbers, or to separate hours from minutes (and minutes from seconds) in a numerical statement of time.

I hope this helps! :3 Have a great day!

1. read the following excerpt from franklin d. roosevelt's "fireside chat 19":

on the other side of the picture, we must learn also to know that guerilla warfare against the germans in, let us say serbia or norway, us; that a successful russian offensive against the germans us; and that british successes on land or sea in any part of the world strengthen our hands.

remember always that germany and italy, regardless of any formal declaration of war, consider themselves at war with the united states at this moment just as much as they consider themselves at war with britain or russia. and germany puts all the other republics of the americas into the same category of enemies. the people of our sister republics of this hemisphere can be honored by that fact.  

the true goal we seek is far above and beyond the ugly field of battle. when we resort to force, as now we must, we are determined that this force shall be directed toward ultimate good as well as against immediate evil. we americans are not destroyers — we are builders.

analyze the effectiveness of this excerpt. how does it function within the speech as a whole? how does the structure of the excerpt to convey the speech's purpose and key points? support your argument with evidence from the speech. (10 points)