Question

Circle the letter of the sentence in which the word in bold-face type is used incorrectly 1.

a. the poster was so large that no amount of tape would make it coherent to the wall

Answer 1

There is only one sentence, and yes it has an incorrectly used word: coherent. Coherent means concise and logical, so a speech can be coherent.

the word needed here is "adherent" - sticking to something, and the confusion probably comes from the fact that they sound similar.