Answer:
Option A.
Step-by-step explanation:
A rational number is a number that can be expressed in a fraction (ratio of integers).
Option A is rational since both quantity are rational
Option B is irrational since
[tex]\sqrt{3}\cdot\sqrt{9}=\sqrt{27}[/tex]
where 27 is not a square of any fractions/ integers. Hence, it cannot be expressed as a fraction and is irrational.
Option C is irrational. Note that PI is irrational. Any rational multiples of an irrational number must also be irrational.
Option D is irrational. Similar to Option B.
