Dionne has decided to major in chemical engineering. during her first semester, she discovers that her professors are giving her more deadline extensions and better grades than the men in her classes. dionne is experiencing

Benevolent sexism

Explanation:

Benevolent sexism refers to a chivalrous attitude toward women, this attitude is sexist because it sees women as in need of men's protection.  

Benevolent sexism is a form of paternalistic prejudice  directed toward women. This sexism corresponds with an attitude of treating women as needing men's protection, help and provision. Thus, people that are benevolent sexists end up overhelping women.

In this example, Dionne decided to major in chemical engineering. However, she discovers that her professors are giving her more deadline extensions and better grades than the men in her classes. We can see that her professors are overhelping her as if she weren't able to achieve the same things during the same amount of time as the men in her class. Thus, this is an example of benevolent sexism.