The first would be A. Adding ellipses after "One day" isn't right, and A is the only one that doesn't do that.
The second is The first game (to be held in the new gym) is against Rocky Point High School. "To be held in the new gym" gives clarification about "the first game."
The third is The new inductee proclaimed, "It (my membership) is my greatest honor!"
"My membership" provides more info on what "it" is.