Answer:
1. Allusion – c
2. Simile – a
3. Metaphor – b
Step-by-step explanation:
a. I defeated my opponent as easily as sliding a knife through butter...
A simile is a comparison using either of the terms "like" or "as".
b. My opponent's face became a white sheet when he saw me arrive...
A metaphor is a comparison without using the terms "like" and "as".
c. He was the rock to my paper, the paper to my scissors
Alluding to the game of rock, paper, and scissors.