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If vector a = 1/√10(3i + k) and vector b = 1/7(2i + 3j - 6k), then the value of vector(2a - b) x [(a x b) x (a + 2b)] is

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If  vector a = 1/√10(3i + k) and vector b = 1/7(2i + 3j - 6k), then the value of vector(2a - b) x [(a x b) x (a + 2b)] is

(A) -3 

(B) 5 

(C) 3 

(D) -5

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Correct option (D) - 5

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