Rank in order, from most to least, the elastic potential energy (usp) a to (usp) d stored in the springs of (figure 1).
a) (usp) d, (usp) c, (usp) a, (usp) b
b) (usp) a, (usp) b, (usp) c, (usp) d
c) (usp) c, (usp) d, (usp) b, (usp) a
d) (usp) b, (usp) a, (usp) d, (usp) c