What technique does the advertisement use to achieve
its purpose?

Explanation:

Advertisement industries use many colorful schemes to attract customers and sell their products. One of the scheme they use is to make their ads colorful and also add and emotional or funny story to their ad to make customers addicted to it. They also try to convince customers that their product is better in a reasonable price which makes customers buy it even if they don't actually need it.

If it is an essay tell me than I can come up with a longer peice of writing on this topic.  I really don't know on what basis you are asking this question

the answer is: b: however, that doesn’t mean that the current drought isn’t real.

c) eager anticipation.