5 Answers: Choice A, B, C, D, E
Basically, it's everything except choice F.
=========================================================
Step-by-step explanation:
The number 26 is a whole number since the set of whole numbers is {0,1,2,3,4,...} and it's also an integer as well because the set of integers includes the negative counterparts. That takes care of answer choices A and C.
The number 26 is rational because 26 = 26/1 which is a ratio or fraction of integers. Because it's rational, that means it cannot be irrational. The term "irrational" means "not rational". This means answer choice B is true while choice F is not true.
The number 26 is a natural number. The set of natural numbers is {1,2,3,4,...} which is effectively almost identical to the set of whole numbers, except 0 isn't involved. This is why choice D is another answer.
Lastly, choice E is an answer because 26 is a real number. Assuming you haven't learned about complex numbers yet, every number you encounter is a real number.
---------
So to summarize, the number 26 is...
- a whole number
- a rational number
- an integer
- a natural number
- a real number
The only thing that it's not is irrational (which would contradict it being rational).