Find the missing character?

The other options are incorrect because they are not letters that come after $\text{I}$ in the alphabet. Option $\text{F}$ is the letter that comes after $\text{E}$ in the alphabet. Option $\text{N}$ is the letter that comes after $\text{M}$ in the alphabet. Option $\text{S}$ is the letter that comes after $\text{R}$ in the alphabet. Option $\text{D}$ is the letter that comes after $\text{C}$ in the alphabet.