Consider the question. There are many sayings and metaphors about flirting, which one could be found in a machine shop?
Options:
- feelings
- sexual excitement
- sparks fly
- problems
- unwanted pregnancy
 What is the step-by-step reasoning process to arrive at the answer: sparks fly?
Sparks fly in flirting means having a spark between two people. A machine shop has various machines that can have spark fly.