Let \angle A B C=24^{\circ} and \angle A B D=20^{\circ}. What is the smallest possible degree measure for \angle C B D ?

**Answer Choices**

A. 0

B. 2

C. 4

D. 6

E. 12

Let \angle A B C=24^{\circ} and \angle A B D=20^{\circ}. What is the smallest possible degree measure for \angle C B D ?

**Answer Choices**

A. 0

B. 2

C. 4

D. 6

E. 12