Difficult
Awesome
Burdensome
Dutiful
Answer is Right!
Answer is Wrong!
The correct answer is C. Burdensome.
A. Difficult is not a synonym of onerous. Difficult means something that is hard to do or understand. Onerous means something that is a heavy or unwelcome responsibility.
B. Awesome is not a synonym of onerous. Awesome means something that is very impressive or daunting. Onerous means something that is a heavy or unwelcome responsibility.
C. Burdensome is a synonym of onerous. Burdensome means something that is a heavy or unwelcome responsibility.
D. Dutiful is not a synonym of onerous. Dutiful means something that is done out of a sense of duty or obligation. Onerous means something that is a heavy or unwelcome responsibility.