Lenard, who is 48, is described as organized and disciplined. which of the big five personality traits would lenard rate the highest in?

The answer is "Conscientiousness".

Conscientiousness is the identity characteristic of being watchful, or cautious. Conscientiousness infers a want to complete an assignment well, and to consider commitments to others important. Principled individuals have a tendency to be productive and composed rather than nice and scattered.