Which sentence from the passage provides the BEST evidence that Mary Pennington's gender was an obstacle to her career?
In 1895, when she was twenty-two, she was eligible for a Ph. D. in
chemistry
Wiley thought Pennington was so talented that she should also work
for the U. S. Government.
Assuming she was a man, the officials in the Department of
Agriculture gave her a job as a chemist.
The companies she worked for as a consultant paid her twice the
salary she made working for the government.