He kept calling but to no avail, what was he hoping to get?
Options:
- communicate
- answer
- attracting ducks
- hang up
- respond
Let's think now! Step-by-step reasoning:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
One calls repeatedly for an answer. Keeping calling means to call repeatedly. Answer is a reaction.
So, the final answer is answer.