Odd ASA test question

[Tru_in_Blu]

I'm working on my test without benefit of my rules book and/or umpire's manual which are currently in storage.

Slow pitch question 40) (Slow Pitch Without Stealing) A runner must return to their base after each pitch.
a. True
b. False

My initial thought is that, of course, runners must return. Then thought about the situation where the pitched ball is batted into play.

Without the benefit of my books and how this might be written in them, I'm hesitant to just say "true".

Most other questions on this year's test seem fairly straightforward. Could be a new high-water mark!