Read the following passage and mark the letter A, B, C, or D on your answer

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 26 to 30.
Why do some people take revenge on others? Why aren’t we able to sort out our problems without seeking to get (26)______ with those who have hurt us? Apparently, we are simply experiencing a deeply rooted part of human nature. Our desire for revenge comes from the brain’s limbic system, the most primitive part of the brain and one that we share with all animals. (27)______, when someone confronts us, we often prefer attacking verbally or physically rather than try to work out a solution together.
However, unlike animals, we also possess a highly evolved cerebral cortex which allows us to plan and analyze – and this can make revenge more than just a(n) (28) ______ reaction. A person who feels they have been wronged may even enjoy planning a creative and appropriate act of revenge. (29) _______people suggest that taking revenge can be seen as a positive move, allowing you to work through your negative emotions. However, it can also be dangerous, and you may risk finding yourself in a situation (20)______ rapidly gets out of hand.