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If 9a^2+4b^2+c^2+21= 4(3a + b - 2c), the...

If `9a^2+4b^2+c^2+21= 4(3a + b - 2c)`, then the value of (9a + 4b - c) is :
यदि`9a^2+4b^2+c^2+21= 4(3a + b - 2c)`, है, तो (9a + 4b - c) का मान क्या होगा ?

A

2

B

16

C

6

D

12

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