Find the missing term in the following series:
U, B, I, P, W, ?
[A]D
[B]F
[C]Q
[D]Z

D
In the above question, the pattern is
$latex U\xrightarrow{\text{+7}} B \xrightarrow{\text{+7}} I \xrightarrow{\text{+7}} P \xrightarrow{\text{+7}} W \xrightarrow{\text{+7}}\textcircled{D}$