Which of the following is a contact force? Magnetic

Friction

Electric

Gravity

It’s Friction Friction is a surface phenomenon. When two surfaces have irregularities that come in contact do they get interlocked preventing them against sliding against each other. So, frictional force is a contact force dependent on surface.
Here, option (B) is correct.
Gravitational force, electrostatic force and magnetic force does not depend on the surface.

By sj wilson · 2005 ·  related articlesschool violence prevention programs fell into four broad categories: universal interferes with their efforts to teach. program for children attending any grade, pre-k through 12th 

Aform of energy that is reflected or emitted from objects in the form of electrical and magnetic waves that can travel through space. there are many forms of  electromagnetic  energy including gamma rays, x rays, ultraviolet radiation, visible light, infrared radiation, microwaves and radio waves.