<span>The sentence that does not contain any errors in capitalization is A. Remember to get some Italian bread. In B, Greek should be capitalized. In C, Caribbean should be capitalized. In D, French should be capitalized. Any adjective containing a country name in it should be capitalized. </span>
An idiom is when a phrase is used, but is not physically appropriate and not happening. Hitting the sack means to fall asleep, not actually hitting a sack :)