Question

Mr. Taylor loved being a crossing guard. He enjoyed laughing and joking with the kids on their way to school. it was only a problem when it was raining out. On rainy days, most of the kids get a ride from their parents, and Mr. Taylor is stuck standing in the rain alone.

Change “it was only a problem…” to “It was only a problem…”
Change “Mr. Taylor” to “Mr. taylor.”
Change “parents” to “Parents.”
No changes required.

Answer 1

It's the first choice

"it was only a problem" is the start of a sentence, so "I" in "It" should be capitalized.