C grill is points up on the face, this one looks like points down. But it's not possible to say anything exact because of the image. Better would be a photo directly from above and low light coming from the side (not in fluid).
Doesn't look wide enough for a "C" Grill-- count the columns. C Grill has to be 18 columns.
This could be a "D" grill. I think I can see 15 columns, if the very faint points on the left side are what I think I'm seeing. 15 columns = "D" grill
14 columns would be either an "E" grill or a "Z" grill. Some of the shaded points on the lower right side look like horizontal rectangles-- a little wider than taller, but you can also make out a "X" in the 4th row from the left, 5th point from the bottom, that doesn't look at all like it has horizontal points.