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Expression of IdeasHardEmphasising which method did better

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - A study of 300 volunteers compared ways of cleaning hands. - Washing with soap removed 90% of the test bacteria. - Sanitiser gel removed 75% of the test bacteria. - Rinsing with water alone removed 40%.

The student wants to emphasise that soap outperformed sanitiser gel. Which choice most effectively uses relevant information from the notes to accomplish this goal?

  1. A. In the study, washing with soap removed 90% of the test bacteria, compared with 75% for sanitiser gel.Correct
  2. B. Both soap and sanitiser gel did better than water alone.
  3. C. The study involved 300 volunteers.
  4. D. Sanitiser gel removed 75% of the test bacteria, making it the most effective method.

Answer: A. In the study, washing with soap removed 90% of the test bacteria, compared with 75% for sanitiser gel.

Soap's figure against gel's: choice A states both and the comparison.

Why the other answers are wrong

B. Both soap and sanitiser gel did better than water alone.
True, but it groups soap and gel together instead of ranking one above the other.
C. The study involved 300 volunteers.
Sample size says nothing about which method did better.
D. Sanitiser gel removed 75% of the test bacteria, making it the most effective method.
Soap, at 90%, did better than gel; this reverses the result.

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