If he measures "How much warmer [which he should]," then he would be measuring quantity and B would be the answer.
Since he is only observing that the reaction container has become warmer, then qualitative data is all that he is measuring. The answer is A
C is not true "How much warmer" is not answered.
The observation is not a number but it is a property. It is qualitative as color would be. (If a reaction changes color it would be qualitative).
Answer: Option (a) is the correct answer.
Explanation:
An observation that can be sensed through touch, taste, smell, hearing etc is known as qualitative observation.
Qualitative observations do not need any measurement.
For example, reaction container is hot and it is felt by touch.
So, it is a qualitative observation.
On the other hand, an observation that can be measured in number is known as quantitative observation.
For example, George has 2 apples. So, the number 2 represents the quantity of apples George has.
Thus, we can conclude that the given observation is an example of qualitative data.
