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The common difference of the AP b(1), b...

The common difference of the AP `b_(1), b_(2) ……,b_(m)` is 2 more than the common differece of A.P `a_(1),a_(2),…….,a_(n)`. If `a_(40) = - 159` , ` a_(100) = - 399 ` and `b_(100) = a_(70)` , then `b_(1) ` is equal to :

A

81

B

`-127`

C

`-81`

D

127

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