Identify the conclusion of the following conditional:

A number is divisible by 3 if the sum of the digits of the number is divisible by 3.

AThe number is odd.
BIf the sum of the digits of a number is divisible by 3, then the number is divisible by 3.
CThe number is divisible by 3.
DThe sum of the digits of the number is divisible by 3.