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Two straight lines `A B\ a n d\ C D` intersect one another at the point `Odot` If `/_A O C+/_C O B+/_B O D=274^0,` then `/_A O D=` (a) `86^0` (b) `90^0` (c) `94^0` (d) `137^0`

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`∠AOC + ∠COB + ∠BOD = 274@(i) ∠AOD + ∠AOC + ∠COB + ∠BOD = 360@(Angles at a point) ∠AOD + 274@ = 360@ ∠AOD = 86@.`
Hence, correct option is (a).
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