Which measurement is quantitative data?

Correct answer: The plant height is twelve centimetres

Quantitative data is information expressed through numbers and, when appropriate, a unit. It tells how much, how long, how tall, how heavy or how many, so it can be measured and compared more precisely. Descriptions such as colour, smell or surface feel are generally qualitative observations because they use words rather than a numerical measurement.

Option D is correct: a plant height of twelve centimetres contains the numerical value 12 and the unit centimetres. The statements that the solution is blue, the smell is strong and the leaf is smooth describe qualities, not measured amounts. A colour or texture could sometimes be studied using instruments, but as written these choices are qualitative descriptions. Thus, the number-and-unit observation is the quantitative datum.