Unit 6 · Identifying Sufficient Information
Warm Winter Confirmed — Are Possums Innocent?
Lesson 11 of 12
About this lesson
Mr Murray confirmed that a warmer-than-normal winter explains why only 5 of his 20 crocus plants grew — so he concluded the possums are innocent. But he started with two possible causes. Does confirming one cause automatically rule out the other? This is the most common single-cause trap in OC TS flaw questions.
Chapters
Question
| Last winter, Mr Murray planted twenty crocus plants but only five of them grew. After some research, Mr Murray found that there were two possible reasons for this: |
|---|
| - The winter may have been too warm, as crocuses need cold weather to grow. |
| - Possums may have dug up the crocus plants for food before they could fully grow. |
Mr Murray: "I checked the weather reports and the average temperature during the winter was indeed higher than normal. That must be the reason why so many of the crocuses didn’t grow, so I shouldn’t blame the possums."
Which one of the following sentences shows that Mr Murray has made a mistake?
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