The relationship of sentence 5 to sentences 2–4 is one of Group of answer choices

addition.

time.

contrast.

illustration. 1The effect of sleep deprivation on your test-taking ability depends on the type of exam questions. 2If they’re multiple choice or true/false questions, a night without sleep won’t affect your ability to deal with them. 3The reason is that in answering such questions you rely on familiar, established problem-solving techniques. 4Such techniques are unaffected by the loss of one night’s sleep. 5If, however, your exam included essay questions, you’d be in trouble. 6To answer this type of question, you need to think flexibly. 7And this ability is diminished after only a single sleepless night.