I believe 8 inches or 3 feet
Happy
Because he said "improved" several times, and improvement is a good thing that makes most people happy
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.