The correct option is A ribosomes, mRNA and ER
A neuron is a nervous cell, composed of three major parts, namely, cell body, dendrites and axon.
The cell body contains cytoplasm with typical cell organelles and certain granular bodies called Nissl’s granules. A Nissl body, also known as Nissl substance and Nissl material, is a large granular body found in neurons. These granules are made up of rough endoplasmic reticulum (RER) with rosettes of free ribosomes, mRNA and are the site of protein synthesis.