The constraint for the North American supply region is:
A) X11 + X21 + X31 + X34 - 5Y11 - 10Y21 ? 0.
B) X11 + X12 + X13 + X14 - 5Y11 - 10Y12 ? 0.
C) X11 + X12 + X13 + X14 - 3200Y11 - 4800Y12 ? 0.
D) X11 + X12 + X13 + X14 - 5Y11 - 10Y12 = 0.
Answer: B
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