AMC8 1986 Problem 8

In the product shown, B is a digit. The value of B is

\begin{array}{cccc} & & B & 2 \\ \times & & 7 & B \\ \hline 6 & 3 & 9 & 6 \\ \end{array}

Answer Choices
A. 3
B. 5
C. 6
D. 7
E. 8