How can you best combine these sentences without changing their meaning?

She and other riders asked all of their biking friends if they would sign the list. They gathered three hundred signatures.

A. She and other riders’ signatures asked all of their friends if they would sign the list, and so they gathered three hundred bikers.

B. She and other riders asked all of their biking friends if they would sign the list, gathering three hundred signatures.

C. She gathered three hundred signatures, so she asked all of their biking friends, other riders, if they would sign the list.

D. She asked all of their biking friends if they would sign the list, so the other riders gathered three hundred signatures.