Final answer:
A person who is helpful and trusting most clearly ranks high on agreeableness.
Step-by-step explanation:
Based on the Big Five trait dimensions, a person who is helpful and trusting most clearly ranks high on agreeableness. Agreeableness is the tendency to be pleasant, cooperative, trustworthy, and good-natured. People who score high on this trait are often described as kind, considerate, and empathetic.