A buyer wished to select a supplier of steel bars. Prototype samples were collected from two suppliers, and their length, which is an important quality characteristic, was measured. The probability distributions for the lengths of the steel bars produced by the two suppliers were given in the following table. Which supplier has a smaller variation?

Value(cm)	Supplier A Probability	Supplier B Probability
1	1/4	1/3
2	1/2	1/3
3	1/4	1/3

Group of answer choices

Supplier A