Which of the following sentences is written correctly?

Question

a. When properly designed, an automobile can achieve great fuel efficiency.

b. When properly designed an automobile can achieve great fuel efficiency.

c. When properly designed, great fuel efficiency can be achieved by an automobile.

d. When properly designed great fuel efficiency can be achieved by an automobile.

I think it's A but C sounds ok too

Answer 1

A is better because it's in active voice.

Answer 2

thank you