According to ASTM C39, what is the required rate of loading for compressive strength testing of cylindrical concrete specimens?
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A
0.05 to 0.15 MPa/s (7 to 21 psi/s)
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B
0.15 to 0.35 MPa/s (20 to 50 psi/s)
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C
0.35 to 0.70 MPa/s (50 to 100 psi/s)
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D
0.70 to 1.40 MPa/s (100 to 200 psi/s)