Which sentence contains correct parallel structure?

a.

Jenny likes rafting, hang gliding, and riding horses.

b.

Jenny likes rafting, to hang glide, and to ride horses.

c.

Jenny likes to raft, hang gliding, and to ride horses.

d.

Jenny likes to raft, hang gliding, and riding horses.

The correct answer is A. Jenny likes rafting, hang gliding, and riding horses.

Explanation

Parallel structure is a term used to refer to the use of the same structure in which two or more ideas have the same importance. According to the above, the correct answer is A "Jenny likes rafting, hang gliding, and riding horses." since it refers to the three activities, in the same way, using the ending with "ing"