The correct option is A 2x+3y=7
eqn of chord of contact from O(2,3) to x2+y2=1
2x+3y=1
So, x=1−3y2
(1−3y2)2+y2=1
9y2−6y+1+4y2=1
13y2−6y=0
y=0 or y=613
So, x=12 or x=−526
So, p≡(12) and (−526,613)
So, mid point of of is m(54,34)
and mid - point of O is N(4752,4526)
So, eqn of line joining M N,
⇒3y+2x=7