Answer: d. a tendency to come to the aid of their coworkers.
Explanation:
When it comes to a team, the most important factor being looked at when people are hired is their team work and how well they will fit into a team and a huge part of fitting into a team is to be able to help out team members when such help is needed.
This is why Blake would most likely be looking for a person that is able to come to the aide of their co-workers as this would move the team forward by strengthening each member so that the team is stronger as a whole.