B.At the end of the movie, the audience applauded loudly, signaling the high quality of the film.
Biased can be both for good or bad, in this case if only one person clapped and the reporter writtes that it was the audience, this is a clear example of him bieng positively biased towards the sucess of the film.
B. You should not use a comma to separate two complete sentences joined by "and."
C. There is no need for commas that indicate added details in a sentence.
D. A parenthetical use of commas is usually confusing to the reader
boyous
boysome
boyful
boyish
Prepositional
Gerundial
Infinitive
Participal
A.). greatly puzzled