The numbers used on the scale for a standard thermometer?

Question

A.whole numbers
B.rational numbers
C.real numbers
D.integers
I think it is B

Answer 1

While temperature is a continuous value (real numbers)
The actual markings will usually be
B: rational (oral thermometers are usually in tenths of a degree)
or, maybe
A: whole numbers. The weather thermometers are usually marked in whole degrees.