AHSME 1993 Problem 8

Let $C_1$ and $C_2$ be circles of radius 1 that are in the same plane and tangent to each other. How many circles of radius 3 are in this plane and tangent to both $C_1$ and $C_2$? $\text{(A) } 2 \text{(B) } 4 \text{(C) } 5 \text{(D) } 6 \text{(E) } 8$