Answer:
"For example, people who are extrinsically motivated become intrinsically motivated with the presence of a threat."
Step-by-step explanation:
Extrinsic motivation is driven by a reward or an external circumstance. Intrinsic motivation is done for the enjoyment of the task itself.
What the paragraph implies is that a threat could suggest that an activity is fun or exciting, and thus many people may angage in it despite the possible negative consequences -and they genuinely enjoy it!
It's an example of inverse psychology, the "forbidden fruit effect".