A vessel of $1 \times 10^{-3} \mathrm{~m}^{3}$ volume contains oil, when a pressure of $1.2 \times 10^{5} \mathrm{~N} / \mathrm{m}^{2}$ is applied on it, then volume decreases by $0.3 \times 10^{-6} \mathrm{~m}^{3}$. The bulk modulus of oil is
(A) $1 \times 10^{6} \mathrm{~N} / \mathrm{m}^{2}$
(B) $2 \times 10^{7} \mathrm{~N} / \mathrm{m}^{2}$
(C) $4 \times 10^{8} \mathrm{~N} / \mathrm{m}^{2}$
(D) $6 \times 10^{10} \mathrm{~N} / \mathrm{m}^{2}$