In the question given below, a part of the sentence is in bold and italicised. Below are given alternatives to the bold and italicised part which may improve the sentence. Choose the correct alternative. In case no improvement is needed, choose option 'D' as the answer.

But in all these cases, conversion from scale have well-formulated.

A.

can be well-formulated

B.

are well-formulated

C.

well-formulated

D.

No improvement

Correct answer is B

No explanation has been provided for this answer.