The best answer is D. field lines should always be crossing each other.
I think it is either D) or E)
But i am going to go with E)
Answer:
F = Force (Measured in Newtons, N), m = Mass (Measured in kilograms, kg), and a = acceleration (Measured in metres per second squared, 
Explanation:
This is Newton's Second Law!
Hope this helps!
PLS mark as brainliest, hope this helps!
All machines are not 100% efficient because of <span>C. Friction</span>