A tall stack of books is sitting on a table. One of the reasons the book stay where they are is because- Choices:

A: The chair is helping to hold the table up.

B: The table is exerting a balanced force on the books.

C: The books are exerting an unbalanced force on the table.

D: The books keep shifting enough to keep the stack balanced.

Please help me!

What is the force of attraction between the particles in a salt crystal

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

What energy is it when you flip on a switch on a lamp