If the hypothesis is that sugar will dissolve faster in hot water what should be measured?

Correct answer: Time taken to dissolve

The direct answer is C, the time taken to dissolve. The hypothesis compares dissolving speed in hot and colder water. Speed here is determined by asking how long the same amount of sugar takes to disappear into the water under controlled conditions. Start a stopwatch when the sugar is added, stop it when it has dissolved according to a stated rule, and compare the times. A shorter time means faster dissolving. Option A, sugar colour, does not measure speed. Option B, cup size, is a possible controlled condition, not the outcome being tested. Option C is correct because time directly measures the rate of this event; ideally water amount, sugar amount, and stirring should also be controlled. Option D, water taste, does not show how quickly sugar dissolved. Memory cue: a speed question needs time.