: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

 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