She decided to finish the work before it became onerous.

The correct answer is C. burdensome.

The word “onerous” means “causing or involving great difficulty or effort.” In this context, the woman is deciding to finish the work before it becomes too difficult or tiring.

The other options are incorrect because:

• A. unfamiliar: The woman is not unfamiliar with the work, she is just trying to finish it before it becomes too difficult.
• B. light: The work is not light, it is burdensome.
• D. unique: The work is not unique, it is just difficult.

I hope this helps! Let me know if you have any other questions.