Punctuate the following sentence correctly using commas, semicolons, or colons.
Jim set a school record for the 100-meter run unfortunately he could not go to state competition.
A. Jim set a school record for the 100-meter run; unfortunately, he could not go to state competition.
B. Jim set a school record for the 100-meter run, unfortunately; he could not go to state competition.
C. Jim set a school record for the 100-meter run; unfortunately he could not go to state competition.
D. Jim set a school record for the 100-meter run: unfortunately, he could not go to state competition.