Determine Whether the Sequence $\ln 7 , \ln 14 , \ln 21 , \ln 28 , \ldots$

Multiple Choice

Determine whether the sequence $\ln 7 , \ln 14 , \ln 21 , \ln 28 , \ldots$ is arithmetic. If so, find the common difference.

A) arithmetic; 14
B) arithmetic; 2
C) arithmetic;7
D) arithmetic; 28
E) not arithmetic