3. What is the best revision to make to sentence 9?

There's no record of Gunn's employers ever realizing
she was a woman because the company assumed
women didn't have the strength required for toting
furs in harsh weather.

There's no record of Gunn's employers ever realizing
she was a woman because, the company assumed
women didn't have the strength required for toting
furs in harsh weather.

Although the company assumed that women didn't
have the strength required for toting furs in harsh
weather but there's no record of Gunn's employers
ever realizing that she was a woman.

Sentence 9 does not need to be revised.