Answer:
call reluctance
Explanation:
Daniel is experiencing call reluctance. This problem often happens with new salespeople who for emotional reasons find it difficult to prospect new customers through leads. Usually this behavior is linked to a mental response to some threat; in Daniel's case, as stated in the statement, he believes it would be an aggressive approach.
Therefore, self-promotion for client prospecting is important, so that Daniel breaks this behavior by changing his beliefs through positive thoughts and examples from previous sales.