To determine what information the sentence would contain if rewritten in active voice instead of passive voice, we can analyze the options provided:
a. it would specify who inspected the wheels - This option highlights that the active voice would clarify the subject performing the action, which is often a key aspect of transforming a sentence from passive to active voice.
b. it would explain why inspection was important - This option focuses on providing reasoning rather than specifying who performed the action.
c. it would specify the frequency of examinations - This option relates to the regularity of inspections but does not connect directly to the transformation from passive to active voice.
d. it would explain the sound of an irregularity - This option refers to a condition or result but does not pertain to the active voice’s focus on the action's subject.
Given these analyses, the best answer is:
a. it would specify who inspected the wheels.
This option directly relates to the change from passive to active voice by indicating who is performing the action.