Multiple choice

Statement I: From 1995 to 2002, the yearly level of infra red rays, to which the average person was exposed, went down considerably.

Statement II: From 1995 to 2002, the occurrence of skin irritation caused by infra red exposure went up threefold from previous levels, which were already high. This was true for those people whose exposure was average for each year during the seven-years period.

Which of the following, if true, would reconcile the apparent inconsistency between Statement I and Statement II?

  1. The skin irritations caused by infra red rays are only temporary.

  2. Atmospheric elements fail to weaken infra red rays.

  3. The period of time between exposure to infra red rays and the incidence of skin irritations caused by such exposure are usually longer than 7 years.

  4. Since 2002, the average level of exposure to infra red rays has gone back up to pre 1995 levels.

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

You need to explain why there were more occurrences of skin irritations between 1995 and 2002 even though people were exposed to infrared rays less frequently. This explains that the level of infrared rays does not affect the number of skin irritations between 1995 and 2002 in that time period.

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