Going for C

From 1) Only angles are given ...no info on radius ...can't calculate

From 2) can calculate the radius, but no info on angle inside the semicircle..can't calculate

Together -

Can calculate radius and then the arc..

BOE + COD = 2 BOE = 120

So angle EOD = 60

... so the arc (2 pi r) * (60 / 360)

but the diagram is not as per the information given..it will look good if we swap D and E...

Generally, these types of questions come with a statutory warning

... not as per the scale ...

By the way, the question will be good if it says BOE = COD = 120, answer will be same