The First Four Terms of a Sequence Are Given $1 , - \frac { 3 } { 2 } , 2 , - \frac { 5 } { 2 }$

Multiple Choice

The first four terms of a sequence are given. Determine whether they can be terms of an arithmetic sequence, a geometric sequence, or neither. If the sequence is arithmetic find the common difference. If the sequence is geometric find the common ratio. $1 , - \frac { 3 } { 2 } , 2 , - \frac { 5 } { 2 }$

A) arithmetic, $d = - \frac { 3 } { 2 }$
B) arithmetic, $d = - \frac { 1 } { 2 }$
C) geomettic, $r = - \frac { 3 } { 2 }$
D) geometric, $r = - \frac { 5 } { 4 }$
E) neither