In working with a potentially new antibiotic, you are attempting to determine where in prokaryotic t

In working with a potentially new antibiotic, you are attempting to determine where in prokaryotic translation this antibiotic has its effect. You have determined thus far that it interacts with a translational factor but need to identify which one. If this antibiotic interfered with elongation, which of the following factors could be a potential site of action? 
A) IF3 interaction with an aminoacyl tRNA 
B) EF-Tu placement of N-formylmethionine onto the ribosome 
C) EF-Tu interaction with an aminoacyl tRNA 
D) EF-Ts translocation of tRNAs from the A site to the P site 
E) all of the above