High and low tides are part of the tidal cycle; high tide is when the level of the water is highest, so it's the farthest <em>inland</em>. Low tide is when the level of the water is lowest, so it's the farthest <em>offshore</em>.
Neap tides are when high tides are lower than normal and low tides are higher than normal. Spring tides are the opposite, when high tides are higher than normal and low tides are lower than normal.
Only low tides makes sense here, so the answer is A.
A. People are motivated by their own fears and selfish desires.
Explanation:
The Option A: "People are motivated by their own fears and selfish desires." truly shows the main theme of the text. It definitely shows what people are motivated to do.
