What does this expression mean: it comes down to?

[Runy]

English Idioms and Expressions, Intermediate level

ESL/EFL Test #17 "Idioms with come", question 7

In the end, it all comes down to the fact that you don't really care about me.

(a) intercedes to
(b) interferes to
(c) conspires to
(d) is because of

English Idioms and Expressions, Intermediate level

ESL/EFL Test #17 "Idioms with come", answer 7

In the end, it all is because of the fact that you don't really care about me.

Correct answer: (d) is because of
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What does this expression mean: it comes down to? Runy

[Mister Micawber]

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'Come down to': To amount to in essence: It comes down to this-- the man is a cheat.
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Native English teacher at Mister Micawber's