I would say C, hope this helps
B because there is a dot in front of the 25 which is also known as a decimal point.
Process of elimination. The others are fractions.
A decimal number, is a number that isn't a whole number, and has decimal places after it. In this case, D. represents the number .25 which can also be written as 0.25, and that, is a decimal number.
Although fractions can be converted into decimal numbers (almost always, exept in some cases, called factors) just by solving them, in your question, they're in the fraction form, so they're not considered decimals.
Hope it helped,
For this case we have that by definition, a decimal number is a number that is composed of a whole part, which can be zero, and by another lower than the unit, separated from the whole part by a point.
According to the options given, we have:
A. it is a fraction
B. 23, is a whole number
C., it is a fraction
D. 0.25, is a decimal number.
The answer to this is B.