His left arm still dangled in the water , and the thing- whatever it was he 'd mistaken for a fish , was still holding it . The light bounced in ripples over its body , illuminating it , but it was n't for another long moment that Atobe saw the tail . " Thank you , " Atobe mouthed to it and its eyes flicked , watching his face , trying to understand . It ... he , whistled and tugged gently on his arm .
According to the above context, choose the best option to answer the following question.
Question: Why did Atobe do this ?
Options:
A. He was trying to catch a fish
B. He had been searching for the fish
C. He wanted to catch the creature
D. None of the above choices .


A