Each item in this section consists of a sentence with an underlined word followed by four words/group of words. Select the option that is nearest in meaning to the underlined word and mark your response on the Answer Sheet accordingly.
The cause of the accident is yet to be `underline("ascertained,")` but police officials suspect the driver of the vehicle allegedly fell asleep.

Options

A. determined
B. curtained
C. thought of
D. being known