Scientists who study ancient cultures discovered much information about the mounds. they believe that mound a at etowah was reserved for the chief of the area. the chief of the town had his home on the mound. the other citizens of the town lived around this mound. the closer a person lived to mound a, the more significant he or she was in the society. mound a reaches about 60 feet high. it is also more than 300 square feet wide at its base. some scientists believe that every time a chief died, a new layer was added to mound. then, a new house was built on the top.
what caused the citizens of the native american town to build another layer on top of the mound?
a) the death of a chief
b) illnesses in the town
c) sightings of explorers
d) tribal religious activities

A) the death of a chief

Explanation:

Option A is the only logical one as there is no mention of other listed options in the text; there are no illnesses, no explorers, and no religious activities. Some scientists believe that every time a chief died, a new layer was added to mound is the sentence directly pointing to A as the correct answer.

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hope this !