AMC8 2000 Problem 21

Keiko tosses one penny and Ephraim tosses two pennies. The probability that Ephraim gets the same number of heads that Keiko gets is

Answer Choices
A. \dfrac{1}{4}
B. \dfrac{3}{8}
C. \dfrac{1}{2}
D. \dfrac{2}{3}
E. \dfrac{3}{4}