Light waves from the sun can travel through outer space and reach the earth. This suggests that light is a(n)
A. mechanical wave.
B. compression wave
C. longitudinal wave
D. electromagnetic wave

D) Electromagnetic waves

Explanation:

This is because with  compression waves and longitudinal waves a medium is required such as air. however in a vacuum this will not work

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.

the area between the graph and the t axis