The answer would be C. The committee's bickering was seriously impeding any real progress.
impede would translate to preventing...such as preventing progress.
The sentence that uses the correct punctuation is D. On her Mediterranean cruise, Mamie visited Barcelona, Spain; Nice, France; and Pisa, Italy. One of the rules in using the semicolon (;) is to separate a group of series containing when one or more the group has commas.
"I haven't seen Piping Plovers on this beach in ages!" exclaimed Carrie, pointing to a flock of small, sand-colored birds collecting along the shore.
