In USVYoung,where Government Agents Put Federal Express Packages to Young Under

In U.S.v.Young,where government agents put Federal Express packages to Young under an x-ray to look at the contents,and he was convicted partly based on that evidence,the appeals court held that:

A) there was no need for a warrant because Young assumed the risk that Federal Express might consent to a search
B) there was a need for a warrant because Young assumed the risk that Federal Express might consent to a search
C) there was no need for a warrant because Young did not assume the risk that Federal Express might consent to a search
D) there was a need for a warrant because Young did not assume the risk that Federal Express might consent to a search
E) none of the other choice are correct