In the inequality \( Bx + 72 < 12 \), the term that is a letter coefficient is:
A. B.
The letter coefficient refers to the constant that multiplies the variable \( x \), which in this case is \( B \). The term \( Bx \) is the entire expression where \( B \) is the coefficient of \( x \), but the coefficient itself is specifically \( B \).