Three College Students Who Attend a Public University Share an Apartment

Three college students who attend a public university share an apartment in Collegetown, USA. Police have heard that three members of the local college's varsity swim team live there and have all recently failed university-administered drug tests. Police show up at the apartment hoping they can acquire to consent to enter. As they approach the apartment, police see that the landlord is standing outside the door. Police ask the landlord to let them in. The landlord, who is a lawyer, refuses, citing the Supreme Court's decision in Chapman v. United States. Irritated, police instead knock on the door. One resident of the apartment is there and allows police to enter. In a common area, police find drug paraphernalia and a small amount of cocaine. They seize this evidence. Just then, a second resident of the home enters and tells police to leave immediately. They do leave, but take the evidence with them.
-The drug testing of these athletes by a public university is likely to be:

A) ruled unconstitutional as a violation of the athletes' 4th Amendment rights
B) upheld based on Supreme Court precedent
C) acceptable only if a warrant is obtained before testing is administered
D) seen as providing probable cause for the search of the students' apartment