What makes me do something is/are A and B

I wonder which is correct and why?
"what makes me do something is A and B"
or
"what makes me do something are A and B"

What is the role of "and" word here? Does the answer changes if A or B is singular or plural? for example:

what makes me do something areyour dogs and your cats

what makes me do something ishappiness andgoodness

someone told me so, but I don't think it is correct

It is an awkward way to speak! The above is sort of correct, though. But it actually should be "make."

Instead, you should write:

The factors that make me do volunteer work are A and B...

The word factors is better than the word what.

With the dogs and cats example, just remember that you use the word "are" if it is plural:
what make me do something are your dogs and your cats

what make me do something are happiness and goodness

The concepts that make me do something are happiness and goodness.
The concepts that make me regret my crime are moral values.
What makes me lie is sneakiness.
The mechanisms that make me lie are illusions.

It is bad to start that kind of sentence with the word what.

:-)

It is a grammar which is easy to understand.

Noun phrase is singular noun, so it begins with is.

That, wh-question and whether is singular nouns

I always use whether to begin the sentence

For example, Whether you like it or not is not important.