My trust in Abah suddenly began to wane.

Question analysis: The underlined word is wane, used in "My trust in Abah suddenly began to wane." We need the word closest in meaning to it in this context.

Concept: To wane means to gradually become smaller, weaker, or less. It is often used for the moon (when it shrinks after being full), and also for feelings, power, or influence, such as trust, interest, or popularity.

Checking each option:

• A. dissipate means to scatter or vanish completely, or to waste something (e.g., "dissipate energy"). It suggests total dispersal, not a gradual lessening.
• B. disappear means to vanish entirely. Wane only means "to start lessening," and the trust has not yet vanished. It "began" to wane.
• C. deteriorate means to become worse in quality or condition. It is about getting worse, not getting smaller in amount. Trust can "deteriorate," but the core idea of wane is reduction in strength or amount.
• D. decrease means to become less or smaller in amount, degree, or intensity. This matches the core meaning of wane: trust becoming less.

Tip: For "wane," think of the moon: after a full moon it gets smaller and smaller. So wane = decrease/diminish/dwindle. The opposite is wax (to grow bigger). Remember the pair "wax and wane" for the moon's cycle.