Adjectives, as the question begins to state, is descriptive words. So...
First I need to buy a red car, that is fast. Next, I want to buy a 42" HDTV, that is thin and sleek. If I have enough money left over, I'm going to buy a fuzzy lava lamp for my living room.
B. Common, everyday language Is your answer
1st: drawing inferences
2nd: testing a hypothesis
3rd: recognizing a problem