The correct option is A 2130
Tobacco mosaic virus (TMV) is a positive sense single-stranded RNA virus that infects a wide range of plants especially tobacco and other members of the family Solanaceae. TMV is a simple rod-shaped helical virus consisting of single-stranded RNA enveloped by a protein coat called capsid. This capsid is made of 2,130 sub units called capsomeres. There are 49 capsomeres on every three turns of the helix. So, the correct answer is '2130'.