It might be D in my opinion? But I probably did my work wrong.. sorry!
Check the picture below.
let's recall that 2π is a full go-around or namely a revolution

Answer: electricity can be used to create magnetism
Step-by-step explanation:
Answer: 3/4
Step-by-step explanation:
1. square root the denominator and nominator, 36= 6 and 64= 8
2. put them together (6/8)
3. simplify 6/8
4. 6/8 divided by 2
5. 3/4 is your answer