The correct answer is C. Embarrass.
The other words, redress, address, and harass, are all spelled correctly.
Embarrass is a verb that means to cause someone to feel ashamed or uncomfortable. It is often used in the phrase "to embarrass someone."
Redress is a noun that means a remedy for a wrong or grievance. It is often used in the phrase "to seek redress."
Address is a noun that refers to the location of a building or person. It is also a verb that means to write to someone or to speak to someone in a formal way.
Harass is a verb that means to annoy or trouble someone repeatedly. It is often used in the phrase "to harass someone."