WorldCitizen

I feel like we are missing some context here for the picture, but I will do my best:

I am assuming here that it's a cell.

It's a eukartyotic cell - it has a clear nucleus, if it didn't; it would be a prokaryotic cell.

Some elements in the eukaryotic cells are ribosomes and mitochondria, but mitochondria are bigger than ribosomes, so it's more likely that the A is mitochondria - and that the scale is too small to show the ribosomes.