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Christian is selling his shoes (s) and t-shirts (t) to make some money for his studies. If each pair of shoes costs Php 600 and each piece of t-shirt costs Php 150 to make at least Php 3000.00. Write a mathematical model that best represents the given problem.

A.2s+t≤3000
B.600s+150t≤750
C.600s+150t≥3000
D.600s+150t≤3000