In the following questions, sentences are given with blanks to be filled in with an appropriate word(s). Four alternatives are suggested for each question. Choose the correct alternative out of the four as your answer.
The correct answer is option -B
Until -up to the time of something,before a time,upto the time that (a condition becomes true),before (a condition becoming true).
So usage of `until' is correct.
Unless -It show condition.
Till -up to (the time that).,during,as long as.
When-Â a what time,at or on which (referring to a time or circumstance),after which; and just then (implying suddenness).
As per the context,Until is the option which best fits here.
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