Which sentence uses the correct punctuation to indicate a pause or a break?
a) The car mechanic, working to quickly had forgotten to reattach the oil filter.
b) The car mechanic, working, too quickly had forgotten, to reattach the oil filter.
c) The car mechanic, working too quickly, had forgotten to reattach the oil filter.
d) The car mechanic working too quickly, had forgotten to reattach the oil filter.