The average value of the numbers $15, 21, 32, 35, 46, x, 59, 65, 72$ should be greater than or equal to $43$ but less than or equal to $44$. Then the value of $x$ should be
- A$42 \leq x \leq 51$
- B$43 \leq x \leq 50$
- C$42 \leq x \leq 49$
- D$43 \leq x \leq 51$
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