How many integrals value of $x$ satisfy the inequality $(1-x^2)(4-x^2)(9-x^2) > 0 ?$

How many integrals value of $x$ satisfy the inequality $(1-x^2)(4-x^2)(9-x^2) > 0 ?$

A. 0
B. 1
C. 3
D. 5
E. Greater than 5

Answer: B

Source: e-GMAT

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