In statement given below, a part of the sentence is enclosed in quotation marks. Below are given alternatives to the quotes part which may improve the sentence. Choose the correct alternative. In case no improvement is needed, option 'D' is 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