Darius's friends know him as someone who values people regardless of their failings. when people spend time with darius, they know he will have an attitude of total acceptance toward them. carl rogers refers to this attitude as:

The answer is "Unconditional positive regard".

Unconditional positive regard, an idea created by the humanistic psychologist Carl Rogers, is the fundamental acknowledgment and support of a man paying little respect to what the individual says or does, particularly with regards to customer focused treatment.

It's most likely choice a, it makes the most sense in my opinion.