The correct answer is: A. till
The word “till” is used to indicate a point in time up to which something will or should continue or happen. In this case, the speaker is asking the listener to wait for them up to the time of 8 o’clock.
The other options are incorrect because they do not convey the same meaning. The word “by” is used to indicate a deadline or a point in time by which something should be done. The word “since” is used to indicate a point in time from which something has been happening or continuing. The word “to” is used to indicate a point in time up to which something will or should continue or happen.
Here are some examples of how the word “till” can be used in a sentence:
- I will wait for you till 8 o’clock.
- The store is open till 9pm.
- I will be working till 6pm.
- The meeting will last till 10am.