I would say that the right answer is B, get the dog, because this answer is only that can fit into this sentence. It will describe that Jadarrus saw the dog but he didn't get him. With the answer A the sentence couldn't make much sense at all.
Also, I would say that there are mistakes in the sentence.
Instead of ''an'' it should be ''and''. Also, ''to'' at the end of the sentence is to much and it should be gone.
