Which of the following is the best definition of a base?
Bases are substances that donate protons,
Bases are substances that accept electrons.
Bases are any substances without hydroxide ions.
Bases are substances that release hydroxide ions.

D

Explanation:

A base contains many Hydroxide ions, so it would release Hydroxide ions.

This is how Google defines a base:

"In chemistry, bases are substances that, in aqueous solution, release hydroxide (OH−) ions, are slippery to the touch ..."

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b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle