:4. A coin will be tossed twice.  If both coins come up heads,
you win a dollar.  If one of the coins comes up heads and the
other comes up tails, you lose a dollar.  If both coins come up
tails, you neither win nor lose anything (to put it another way,
you win 0 dollars).  As far as your chances of winning or losing
money, this game is like the sum of one draw from one of the
boxes of figure ? on page ? of the exam.  The right box is <p>

a.  Box (a) of the figure
 b.  Box (b) of the figure
 c.  Box (c) of the figure
 d.  Box (d) of the figure
 e.  Box (e) of the figure