2. Given that $a$, $b$, $c$, and $d$ are distinct positive integers, and $a b c d=441$. Then the value of $a+b+c+d$ is ( ).
(A) 30
(B) 32
(C) 34
(D) 36
2.B.

Since $441=1 \times 3 \times 7 \times 21$, therefore,
$$
a+b+c+d=1+3+7+21=32
$$