To answer this question, we need to understand the usage of "until" and the meaning of the sentence.
The word "until" is a preposition that indicates a point in time or an event that marks the end of a period. In this case, the given sentence "Please finish your work UNTIL five o'clock" implies that the person should complete their work by the time it is five o'clock.
Therefore, the correct answer is:
Option A) True - This option is incorrect because the sentence actually means that the person should finish their work before five o'clock, not until five o'clock.
Option B) False - This option is correct because the sentence implies that the person should complete their work before five o'clock, not until five o'clock.
The correct answer is B) False.