Answer:
Option (D). 129°
Explanation:
In the figure attached,
AB and CD are the diameters intersecting at the center of the circle F.
Central angle AFC = 129°
m(
) = 129°
m(∠AFD) = 180° - (m∠AFC)
= 180° - (129)°
= 51°
Since m∠AFD = m∠BFC = 51° [Vertical angles]
Therefore,

Now,
= 180°
51° +
= 180°
= 180° - 51°
= 129°
Therefore, Option (D) will be the answer.