Our refrigerator is very dirty. it is so gross! the outside is full of dirty fingerprints. the inside is full of drips and spills. even the top of the refrigerator is sticky, dusty, and greasy. i am glad that it is not my turn to clean out that disaster area!

which best describes the variety of sentence length in the provided paragraph?
a) the writer does not vary her sentence length; she uses average length sentences.
b) the writer uses short and long sentences, but no average length sentences.
c) the writer varies her sentence length by starting off with several average ones and finishing with two longer ones.
d) the writer varies her sentence length by starting off with several short ones and finishing with two longer ones.