Which Statement is true about the relationships between the number sets

Some irrational numbers are also integers.
Some irrational numbers are also integers.

All rational numbers are also integers.
All rational numbers are also integers.

Whole numbers include all natural numbers and 0.
Whole numbers include all natural numbers and 0.

Not all natural numbers are real numbers.
Not all natural numbers are real numbers.

All of the statements are true.

But which one is right.

Apologies for the confusion. The correct statement is:

Whole numbers include all natural numbers and 0.

Alright. Next question:

Which of the following is true about -9?

It is a whole number but not an integer.
It is a whole number but not an integer.

It is both an integer and a whole number.
It is both an integer and a whole number.

It is an integer but not a rational number.
It is an integer but not a rational number.

It is an integer but not a whole number.
It is an integer but not a whole number.

Which answer is right?

The correct answer is:

It is both an integer and a whole number.

Ready for the next?

Yes, please proceed with the next question.

A sign in a gas station advertises gas at the rate of $3.39910 per gallon. How many dollars does a gallon cost, writing the price strictly as a decimal?

What is the answer?

The answer is $3.39910, as the price is already given in decimal form.

Which set of numbers is always rational?

Positive Numbers
Positive numbers

Decimals
Decimals

Fractions
Fractions

Integers
Integers