Mario sees popcorn and pretzels as perfect substitutes. He is always willing to substitute 3 cups of popcorn for 1 cup of pretzels. If Mario consumes only popcorn, then we know that the relative price of popcorn in terms of pretzels is:
A.
. less than 0.33.
B.
. greater than 0.33.
C.
. between 0.33 and 3.
D.
. greater than 3.
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