There are no adjectives in the sentence. Usher is a singer, making that a proper noun. Juggles is a action verb. Tennis Balls is a compound noun.
The sentences that use the punctuation mark, colon (:) correctly are: Option B. Whales primarily consume four sources of food: shrimp, larvae, plankton, and krill. Option D. Our bus will stop in these cities: Knoxville, Atlanta, and Tallahassee. And Option E. Please pack the following: a sleeping bag, a change of clothes, and a flashlight.
The answer is one, one person from each group visited the group.
1/8+1/8=1/4
1/4+1/4=1/2
1/2+1/2=1
D. The author is using understatements. This is a common technique when talking about something fairly serious or upsetting, as it creates a shocking response.