If q is the average sewage flow from a city of population P, the maximum sewage flow
A. $${\text{Q}} = \left( {\frac{{4 + \sqrt {\text{P}} }}{{18 + \sqrt {\text{P}} }}} \right){\text{q}}$$
B. $${\text{Q}} = \left( {\frac{{18 + {\text{P}}}}{{4 + \sqrt {\text{P}} }}} \right){\text{q}}$$
C. $${\text{Q}} = \left( {\frac{{18 + \sqrt {\text{P}} }}{{4 + \sqrt {\text{P}} }}} \right){\text{q}}$$
D. $${\text{Q}} = \left( {\frac{{5 + \sqrt {\text{P}} }}{{15 + \sqrt {\text{P}} }}} \right){\text{q}}$$
Answer: Option C
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