Tracy Is Working on Her Final English Essay for School

Tracy is working on her final English essay for school. She has a reputation for expressing herself well but makes careless punctuation errors, especially with regard to comma placement. To ensure that her comma placement is accurate this time, she should use a comma to separate:

A) the parts of one measurement.
B) two unrelated numbers that end up adjacent to each other in a sentence.
C) a dependent clause that provides essential information, from a main clause.
D) the last adjective in a series of consecutive adjectives, from the noun.