The word which best completes the given sentence is:
Transition Words
These are words that are used to link ideas in a given sentence and they are most effective in a compound sentence.
With this in mind, we see that the transition word "Although" is used which means that her friends saw that she needed their help, but refused to give it.
As a result of this, we can say that because they knew she was in trouble and did not help, then they hesitated to help her.
The answer cannot be stopped because that would mean they were already trying to help.
Therefore, the correct answer is option B
Read more about transition words here:
https://brainly.com/question/1101400
