I have been in doubt a lot, so please help me with this question:
What to do when in doubt?

Lordosis can often be prevented by strengthening core muscles in the abdominals and back. a. true b. false

Which is a physical sign of stress? a: unexplained euphoria b: feelings of invincibility c: inability to sleep d: visual hallucinations

Which is one way that sinkholes can form? a) tornadoes touch down and destroy trees and brush b) rivera overflow during a storm and wash away nearby land c) rainwater flows away from a depression in the ground d) groundwater dissolves the limestone and other rocks in the ground