So,
First, we have to know what all these words mean, starting with the smallest set to the largest set.
An integer includes all of the whole numbers plus their negatives.
Rational numbers include the integers and the fractions and decimals in between.
(we'll come back to irrational numbers)
Real numbers include the rational numbers and the irrational numbers.
Irrational numbers are decimals that are non-terminating and non-repeating. For example, pi.
1.76
It is a number.
It is an integer.
It is a rational number.
It is a real number.
Real + rational + integer + number
There are two correct options: C and D.
