Directions :
Given below are some idioms/phrases followed by four alternative meanings to each. Choose the response (a), (b), (c) or (d) which is the most appropriate expression.
`underline("Out of the blue.")` (a) Undoubtedly (b) Unexpectedly (c) Unbelievably (d) Unconcerned

Options

A. Undoubtedly
B. Unexpectedly
C. Unbelievably
D. Unconcerned