When should quotation marks be used? a. title of short works, title of long works, symbol for inches, direct quotation b. title of short works, humor or irony, symbol for feet, direct quotations and paraphrasing c. title of short works, strong emotion or emphasis, symbol for feet, indirect quotation d. title of short works, some cases of humor or irony, symbol for inches, direct quotation

The right option is D. Title of short works, some cases of humor or irony, symbol for inches, direct quotation.

We can discard options B and C because the symbol for feet is a single prime, or apostrophe ('), while the symbol for inches is a double prime, denoted by a quotation mark (").

Option A should be discarded because it includes the titles of long works, which should be italicized and doesn't include the use of quotation marks in cases of irony and humor.

An example of using quotation marks with irony is:

After repeating fifth grade for the second time, he already considered himself an "expert".

Finally, when using quotation marks for direct speech, we must remember to include the exact words the person used. They are also frequently used when writing a dialogue or transcribing someone's thoughts.    

1.) is true

2.) is false