Question

Which of these sentences uses the passive voice?

A. You can succeed if you set goals and work hard.
B. If I set goals and work hard, I can succeed.
C. Success can be achieved by setting goals and working hard.

Answer 1

Since A and B are both sentences which use the active voice, the correct answer is C, where 'can be achieved' is the passive form. 

Answer 2

C. Success can be achieved by setting goals and working hard.

Step-by-step explanation:

The passive voice is used to show interest in the person or object that experiences the action rather than the person or object that performs the action. This type of voice is used in formal texts, passing it to the active voice will make the writing clearer and easier to read.

In the answer given the object that experiences the action is the word "success" and receives the "set of goals and work hard".

I hope this answer helps you.