One of the Following Is False; Indicate by Letter Which $\in$

Multiple Choice

One of the following is false; indicate by letter which one:

A) 4 $\in$ {3, 4, 5, 6}
B) 4 $\subset$ {3, 4, 5, 6}
C) 5 $\in$ {3, 4, 5, 6}
D) {4} $\subset$ {3, 4, 5, 6}