George miller's research on short-term memory capacity indicated that we can only store in our short-term memory.

up to 7 or 8 items no more than 20 or 30 seconds at a time

hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.

answer; make a no-nonsense accusation of the other;