Question

Being cleaner and longer-buring compared with bituminous coal, anthracite was the first coal widely used in the United States for both domestic and industrial purposes.

• A. Being cleaner and longer-burning compared with
• B. Both cleaner and more longer-burning compared to
• C. Cleaner and longer-burning than
• D. By burning longer and more clean than
• E. Cleaner as well as longer-burning, unlike

Answer 1

The correct option is C Cleaner and longer-burning than

The underlined portion is ungrammatical [as its of 'being' and 'compared clashes with the tense pattern of the rest of the sentence] and does not make much sense in the given context. Only C rectifies this error without adding any new error(s).