Fill in the blank with the most appropriate word.
Heroes ____ by people because they served their people and their country.

The correct answer is Option C: are remembered. The sentence is in the present tense, and the word "heroes" is a plural subject. Therefore, the appropriate verb form is "are remembered" to match the plural subject and convey the idea that heroes are currently being remembered by people. The other options are not correct:
A. "is remembered" (Incorrect) - This is in the singular form and does not match the plural subject "heroes."
B. "was remembered" (Incorrect) - This is in the past tense and does not match the present tense context of the sentence.
D. "had been remembered" (Incorrect) - This is in the past perfect tense and is not appropriate for the present tense context of the sentence.