Doctor, my wife is unwell. May i know ______ the total expenses on her treatment?

a) what would be        b) what will be        c) what could be        d) what may be

Solution:

Doctor, my wife is unwell. May i know what will be the total expenses on her treatment?

The phrase "what will be" implies a prediction or estimate of the future expenses, which is the most relevant information being asked for in this context. 
Hence, the correct option is (b) what will be 

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