Q 1117156089.     If `a_1,a_2,a_3,a_4` are in H. P, then `1/(a_1a_4) sum_(r=t)^3a_ra_(r+1)` is a root of which of the following quadratic equations

A

`x^2 + 2x – 15 = 0`

B

`x^2 - 6x -8 = 0`

C

`x^2 - 9x + 20 = 0.`

D

`x^2 + 2x + 15 = 0`

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