Which method will successfully launch the spelling and/or grammar checker dialog box?
click the review tab on the ribbon; in the proofing group, click on the spelling & grammar button.
press the f7 key on your keyboard.
right-click a word that is marked with a spelling or grammar error, and select spelling or grammar from the menu list.
all the above statements are correct.

All three statements are correct, as they will all allow you to launch the Spelling/Grammar checker.

the right won is D

Explanation:

the major difference between the two is the objective and the reward of the game. candy crush has a puzzle theme with the objective of meeting a specific quota of points or objects, you are able to gain access to the next level and compete with peers on the process. on duolingo the objective is rather different, you are given sets of questions for you to answer for you to move to the next level and as for the reward, you are able to learn available language as this is an app developed to teach the user about other languages.