"On the mode of communication of cholera" was written by Dr. John Snow in order to spread awareness about the disease and the new ideas giving scientific proof along with them. Through his text, he aimed at persuading the citizens and the officials to become more aware regarding the sanitation of their surroundings as Cholera is transmitted via the dirty surroundings. In his text he discussed the causes of spread, instances and scientific evidence of Cholera of its communication among different populations.
Hence, the correct answer is 'Option A and B'.
Ribosomes are the site of translation of strands of transferRNA into chains of amino acids. Ribosomes allow the reading of the genetic information coded for by the tRNA which codes for the position of amino acids along a protein

They are further classified into: fish, amphibians, birds, reptiles and mammals.
I hope I've helped : )
Their difference is that Eukaryotes posses nucleus & nuclear bound organelles whereas prokaryotes doesn't!
Hope this helps!