CN Railways is North America's fifth largest railway. Use the financial information in the table to calculate CN$\text{'}$s maximum internal growth rate.

CN Railway Company

As of December $31,$ Year $10$

ROE

$8\mathrm{.}62\%$

ROA

$3\mathrm{.}02\%$

Net Profit Margin

$9\mathrm{.}35\%$

Total Asset Turnover

$0\mathrm{.}32$

Dividend Payout Rate

$30\%$

Group of answer choices

$9\mathrm{.}4\%$

$6\mathrm{.}4\%$

$2\mathrm{.}2\%$

$3\mathrm{.}1\%$