B.
This is because it tells us there is cows in the story
"D. subject-been agreement" is the problem with this sentence. It should be "He wants to give me a bright red car" or ever "He wanted to give me a bright red car"
When different ideas come to your head whether they're correct or not. Then eliminate the non-valid ones.
Answer:
Stop buying extra things? Don't waste electricity.
Explanation: