When the COVID-19 virus enters an individual’s body, it aims at creating copies of itself. When it makes an error in this copying process, we get a mutation. In this case, the virus replaced the aspartic acid (D) in the 614thposition of the amino acid with glycine (G) . Hence the mutation is called the D614G. Hence option 3 is Correct. This particular mutation aids the virus in attaching more efficiently with the ACE2 receptor in the human host , thereby making it more successful in entering a human body than its predecessors. D614G show increased infectivity but it also displays a greater ability at attaching itself to the cell walls inside an individual’s nose and throat , increasing the viral load.