With the help of the classification tree shown, which of the following statements is correct? 
AEvery real number is rational.
BEvery irrational number is imaginary.
CEvery natural number is an integer.
DEvery fraction is irrational.
Answer & Solution
Correct answer: C. Every natural number is an integer.
From the number classification tree, natural numbers are shown as a subset of integers. Real numbers include both rational and irrational numbers, so A and B are false. Fractions can be rational, so D is false.
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