$x^r$ occurs in the expansion of ${\left( x^3 + \frac{1}{x^4} \right)^n}$ provided -
- A$2n - r$ is divisible by $5$
- B$3n - r$ is divisible by $5$
- C$2n - r$ is divisible by $7$
- D$3n - r$ is divisible by $7$
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