The correct choice from given option is "D", "Lactobacillus" It seems proper to explain a bit about the types of cells here. Two type of cells are: 1) Prokaryotic: these cells have no nucleus and they are small and simple. 2) Eukaryotic: These cells have a nucleus and are large and complex as opposed to prokaryotic.
"Lactobacillus" belong to first stated category here.
