A lawyer, during jury selection, notices that one young man is formally dressed in a navy blue suit, white shirt, and dark tie. He concludes that the young man is politically conservative. This conclusion is an example of

The answer is implicit personality theory.

Explanation:

Under this bias, a person forms an impression of someone else using the available (usually visual) information about him. This is done in a subjective manner, as everyone has a different pre-conception about personalities.

This process is automatic or implicit, hence the name.