Solve the problem.Jerry builds rocking chairs and porch swings and sells them a a local flea market. The lumber requirements for each type of item are summarized in the table below. 
Currently, Jerry has 100 2×4's, 55 2×6's, and 100 1×4's in stock. Rocking chairs sell for $40 and porch swings sell for $65. How many pieces of each type of lumber are left over after Jerry has built the number of chairs and swings that maximize his revenue?
A. 4 2×4's, 0 2×6's, and 5 1×4's.
B. 0 2×4's, 0 2×6's, and 15 1×4's.
C. 15 2×4's, 0 2×6's, and 0 1×4's.
D. 5 2×4's, 0 2×6's, and 4 1×4's.
Answer: C
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