if you put n=0, then also it is divisible by 7.

So, the answer will be:- **B.all non-negative integer values of n**

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The expression $3^{2n+1} + 2^{n+2}$ is divisible by $7$ for

- all positive integer values of $n$
- all non-negative integer values of $n$
- only even integer values of $n$
- only odd integer values of $n$