If $x$ and $y$ are positive integers and $n = 5^x + 7^{y + 3},$ what is the units digit of $n?$

If $x$ and $y$ are positive integers and $n = 5^x + 7^{y + 3},$ what is the units digit of $n?$

(1) $y = 2x - 16$
(2) $y$ is divisible by $4.$

Answer: B

Source: Manhattan GMAT

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