Which of the following sentences is grammatically correct when describing hearing a friend's footsteps while alone?
Explanation
Option C is correct because 'footsteps' is plural, requiring the plural verb 'are'. Options B and D are incorrect due to singular verb usage ('is' and 'was') with the plural noun 'footsteps'. Option A is grammatically correct but differs in structure from the passive voice used in C, and option E, while correct, is not in the passive form as the question implies.