The correct answer is: C. otherwise
The word “otherwise” is used to introduce a condition or consequence that will happen if the first condition is not met. In this case, the speaker is telling the listener to run fast, otherwise they will not get their ticket.
The other options are not as appropriate in this context. The word “but” is used to contrast two things, but in this case, the speaker is not contrasting two things. The word “as” is used to introduce a reason or explanation, but in this case, the speaker is not giving a reason or explanation. The word “and” is used to join two things together, but in this case, the speaker is not joining two things together.
Here are some examples of how the word “otherwise” can be used in other sentences:
- You need to study hard, otherwise you will fail the test.
- I will call you if I need you, otherwise don’t worry.
- You should wear a coat, otherwise you will get cold.