Which curves show the results of calculating the initial rate of reaction of an enzyme:
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when the substrate concentration is varied, under optimal conditions and without an inhibitor;
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when the substrate concentration is varied, under optimal conditions and fixed, low concentration of a competitive inhibitor?
A. (1) curve P; (2) curve S
B. (1) curve R; (2) curve P
C. (1) curve Q; (2) curve R
D. (1) curve P; (2) curve Q
E. (1) curve R; (2) curve S