The correct answer is decline.
The correct answer is (D) To decline; to worsen, diminish, waste or fade away, recede, or decay. Also, to flow backward or away; as the water of a tide; to draw back from the shore (of tidal water).
Ebb comes from Old English ebba, ebbian (low tide), Old Saxon ebbia, German ebbe.
Examples of use:
- His confidence ebbed as the day of the match approached.
- Life slowly ebbed from stricken animal.