Who was Annie apologizing to in episode 13? After the great victory gained by humans against the Titans in episode 13, when the trainees were collecting dead bodies, Annie was apologizing to a dead soldier. Who was this? Was it Marco?
In wiki it is stated.


  Despite her seeming callousness, she has expressed a level of guilt
  and shock, most notably when apologizing to a certain corpse after the
  battle of Trost




Various sources say it was Mina which may be true because;


  Mina is shown sitting with Annie at the tables in the background of the
  first few episodes. That shows that they had some sort of friendship
  between them, as Annie is asocial and would have otherwise sat alone.


As counter argument: It is stated that Mina's head is bitten off but in the anime there is no such scene.  


  After Eren's leg is bitten off suddenly by one of the Titans, she and
  the other two attempt to kill the Titan that injured him. However, a
  group of Titans arrive out of no where and one of them kills Nac,
  catching her off-guard as another Titan grabs her 3D Maneuver Gear's
  wire, Mina killed anime Mina is caught by a Titan.  knocking her over
  to the wall. When she realizes where she is, it is already too late
  for her to escape; she is grabbed by the Titan and her head is bitten
  off