Answer: A. contains a number and a unit
Step-by-step explanation:
Quantitative observations measure the quantity, or the amount, of a certain thing. Therefore they must always use a number value to measure the amounts, and a unit to signify what the amount is for.
Math is real hard but I think irrational don’t quote me on that
0.3333333333... = 1/3
You can just say 0.3 repeating to say 0.33333...