In multiple-choice questions, often several of the answers seem feasible, and choosing the best answer can then be tricky. But here you're given a break because only A is feasible. B and C are ungrammatical.
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Masanori Takaoka In spite of the firefighters’ bravery and skill, (A.all of their B.all to their C.by their D.their all) best efforts were of no use and the house burned down.The answer is A, but why not D?Because "their all best efforts" is just not the correct word order. "all their best efforts" is correct.
Masanori TakaokaThe answer is A, but why not D?It can't be D because the two determiners "their" and "all" are in the wrong order.