Which statement best describes the relative age of layer D? O A. Layer D is older than layer C.
B. Layer D is younger than C.
C. Layer D is older than B.
O
D. Layer D is the same age as the fault at E.

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .