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If `a=3hati-2hatj+hatk,b=2hati-4hatj-3hatk and c=-hati+2hatj+2hatk`, then a+b+c is

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If `a=3hati-2hatj+hatk,b=2hati-4hatj-3hatk and c=-hati+2hatj+2hatk`, then a+b+c is
A. `3hati-4hatj`
B. `3hati+4hatj`
C. `4hati-4hatj`
D. `4hati+4hatj`
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Correct Answer - C
`a+b+c=(3+2-1)hati+(-2-4+2)hatj+(1-3+2)hatk`
`=4hati-4hatj`
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