U$.$S$.$ Customs and Border Protection $($CBP$)$ has welcomed three new canine teams, all of which have been assigned to the El Centro Sector of the U$.$S$.$ Border Patrol. The teams graduated from a required seven$-$week Canine Academy course and are thereby certified in the identification of concealed humans and narcotics.From the information given above, it CANNOT be validly concluded that

A$)$ if the three canine teams had not been certified specifically in the detection of concealed humans and narcotics and had not been assigned to El Centro Sector, we could infer with certainty that they had not graduated from the Canine Academy B$)$ if the three canine teams had not graduated from the Canine Academy, then either they would not have been certified in thedetection of concealed humans and narcotics or they would not have been appointed to El Centro Sector, or both consequences would not have occurred C$)$ given that the three canine teams have been certified in the detection of concealed humans and narcotics and have been assigned toEl Centro Sector, it follows that they did not fail to graduate from the Canine Academy D$)$ no canine teams that have been assigned to El Centro Sector after being certified in the detection of concealed humans and narcoticshave failed to graduate from the Canine Academy E$)$ all canine teams that have been certified in the detection of concealed humans and narcotics and have been assigned to El CentroSector must have graduated from the Canine Academy