(1) I participated in a summer reading program when I was a kid. (2) It motivated me to read more. (3) There would be prizes for reading a lot of books. (4) It helped to participate with friends. (5) We would encourage each other to read. (6) Reading was a fun thing to do with my friends. (7) We still read together. (8) We are in high school now. (9) The summer reading program helped me developed a habit of reading. (10) I encourage libraries to continue summer reading programs. Which of the following revisions to sentences 4-5 best improves the sentence variety while using correct grammar and punctuation?
Select one:

It helped to participate with friends: we would encourage each other to read

It helped to participate with friends because we would encourage each other to read.

We would encourage each other to read, it helped to participate with friends.

Participating with friends, the summer reading program, helped: we would encourage each other to read.