Deduction applies a general rule to a specific case

During construction planning, a geologist is consulted regarding building a reservoir in a rocky dry region. In deciding whether the land can withstand a construction or not, what power source gives the geologist's decision more credibility?

a. Expert power b. Referent power c. Reward power d. Legitimate power

For thousands of years, humans lived in ______ communities.

A) interconnected B) global C) national D) isolated