Write the following sets in roster form : The set of all letters in word TRIGONOMETRY

Question

$\begin{array}{1 1}(A)\;E=\{T,R,I\}\\(B)\;E=\{T,R,I,G,O,N,M,E,Y\}\\(C)\;E=\{R,I,G\}\\(D)\;E=\{T,R,I,G,O,N,M\}\end{array}$