Answer:
d. Deep-level diversity
Explanation:
The term diversity includes the differences that are possessed by the individuals and that distinguishes them from each other. The variation in physical attributes, beliefs, nationality, religion and other such aspects helps in building what is termed to be diversity.
Deep-level diversity is characterized with the attributes that are non-observable. The beliefs, ideas, values and religion are the attributes of deep-level diversity.
According to the given excerpt, the cultural backgrounds and outdoor interests are the aspects that are unobservable and therefore grouped under deep-level diversity.