Determine Whether the Sequence Is Arithmetic $\frac { 13 } { 2 }$

Multiple Choice

Determine whether the sequence is arithmetic.If so,find the common difference. ?
7, $\frac { 13 } { 2 }$ ,6, $\frac { 11 } { 2 }$ ,5,...
?

A) Arithmetic sequence,d = -1
B) Arithmetic sequence, $d = \frac { 3 } { 2 }$
C) Arithmetic sequence, $d = - \frac { 1 } { 2 }$
D) Arithmetic sequence,d = -2
E) Not an arithmetic sequence