Sentence Improvement - Verbal and Reasoning

Directions to SolveIn questions given below, a part of the sentence isitalicised and underlined. Below are given alternatives to the italicised part which may improve the sentence. Choose the correct alternative. In case no improvement is needed, option 'D' is the answer.
Q1:

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

ANS:B - are well-formulated

No answer description is available.