The Diffusion Constant for Oxygen Diffusing Through Tissue Is $1.0 \times 10^{-11} \mathrm{~m} 2 / \mathrm{s}$

The diffusion constant for oxygen diffusing through tissue is $1.0 \times 10^{-11} \mathrm{~m} 2 / \mathrm{s}$ . In a certain sample oxygen diffuses through the tissue at a rate of $2.0 \times 10^{-6} \mathrm{~kg} / \mathrm{s}$ . If the thickness of the tissue is doubled, then what is the rate of oxygen flow through the tissue?

A) $0.6 \times 10^{-6} \mathrm{~kg} / \mathrm{s}$
B) $0.4 \times 10^{-6} \mathrm{~kg} / \mathrm{s}$
C) $1.2 \times 10^{-6} \mathrm{~kg} / \mathrm{s}$
D) $1.0 \times 10^{-6} \mathrm{~kg} / \mathrm{s}$
E) $1.5 \times 10^{-6} \mathrm{~kg} / \mathrm{s}$