Answer :
Option A is the correct answer.
The adaptive for the larger (host) cell to keep the engulfed cell alive, rather than digesting it as food because the engulfed cell provide the host cell with adenosine triphosphate (ATP).
What is Adenosine triphosphate?
An organic substance called adenosine triphosphate provides energy for a variety of biological functions in living cells, including muscular contraction, nerve impulse transmission, condensate dissolving, and chemical synthesis.
At the cellular level, adenosine triphosphate is utilized and stored as energy (ATP). Adenine, ribose, and three serially linked phosphate groups make up the nucleoside triphosphate ATP.
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