Concept:The adjective "satisfied" is followed by the preposition "with": a person is satisfied with something (pleased or content with it).Solution:The sentence says the mother was not pleased with his explanation.The correct pattern is "satisfied with + thing"."Satisfied in", "satisfied to" and "satisfied on" are not correct before a noun like "explanation".Correct sentence: "Akesi's mother was not satisfied with his explanation."Answer:Option C (with)