The sixth term of an A.P. a1,a2,a3,...an...

The sixth term of an `A.P.` `a_1,a_2,a_3,...a_n` is 2. If the quantity `a_1 a_4 a_5` is minimum then the common difference of the `A.P.`, is (A)`2/3` (B)`8/5` (C)`1/3` (D)`2/9`

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