Astudent is examining the gas inside a helium balloon. If the gas composed of only helium atoms what can the student.conclude

A. The gas is a pure substance because it is made up of one type of element

B. The gas is a pure substance because it is made up of mixtures.

C.The gas is an impure substance because it is inside a balloon

D.The gas is an impure substance because it's ima gaseous state