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The acute angle between the line joining...

The acute angle between the line joining the points A(2,1,-3), B(1,-1,2) and the line `vecr = (2hati - hatk) + lambda(3hati + hatj)` is

A

`cos^(-1)(1/(2sqrt(3)))`

B

`cos^(-1)(1/sqrt(3))`

C

`cos^(-1)(1/(5sqrt(10)))`

D

`cos^(-1)(3/(5sqrt(10)))`

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The correct Answer is:
A
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