Select the most appropriate word to fill in the blank.
The instructions _________ I just couldn't follow them.

The correct option to fill in the blank is (c) were complicated.
Explanation:
The word "instructions" is plural, so it requires a plural verb. "Were complicated" is the correct form, as it agrees with the plural subject "instructions."
Meanings of all options:
· Is complicated: Incorrect, as "is" is singular and does not agree with "instructions."
· Are complicate: Incorrect, the word "complicate" should be in the past participle form "complicated."
· Were complicated: Correct, past tense agreeing with the plural subject "instructions."
· Was complicated: Incorrect, "was" is singular and does not agree with "instructions."