Calculate the Concentration of Argon in Lake Water at 20 ^$\circ$

Multiple Choice

Calculate the concentration of argon in lake water at 20 ^$\circ$ C.The partial pressure of argon is 0.0090 atm and Henrys constant is 0.0015 mol.L^-1.atm^-1.

A) 1.5 * 10^-3 M
B) 9.0 * 10^-3 M
C) 1.4 *10^-5 M
D) 6.0 M
E) 0.17 M