He . . . . . . . . all his energies to bear upon the task.

The correct answer is: D. devoted

The word “devoted” means to give all of one’s time, energy, and attention to something. In this case, the man is devoting all of his energies to the task at hand.

The other options are not as accurate. The word “put” means to place something somewhere. The word “organized” means to arrange something in a systematic way. The word “brought” means to carry something from one place to another.

In this case, the man is not placing his energies somewhere, he is not arranging them in a systematic way, and he is not carrying them from one place to another. He is simply giving them all to the task at hand.