ABC Cost Drivers

Hello,

I have the BPP Study guide aswell as the revision guide (the revision guide i will use when i have finished the lectures)
one of the chapter round up questions is
The cost driver for Quality inspection is likely to be batch size true or false – i have put true but the books answer says its more than likely number of production runs – however on looking back to understand the answer it says in a table that cost driver – batches produced is likely to be associated with costs such as purchase orders, set-ups and inspection.
so can you please explain why their answer says production runs.

thanks