Which of the following is a true statement?
a. electromagnetic waves consist of only changing electric fields.
b. electromagnetic waves are longitudinal waves.
c. electromagnetic waves do not always need a medium to travel.
d. electromagnetic waves can vary in speed, wavelength and frequency.

no. bullets are macro objects. wave nature is for light waves, extremely tiny particles. if a light particle was the size of your finger, the bullet would be the size of the universe. so basically, that huge difference in size makes the wave nature of matter insignificant.

tbh i don't know the answer for this question