Let $A = \{1, 2, \{3, 4\}, 5\}$. Which of the following statements is incorrect and why?
${3, 4} \subset A$

(A) Given the set $A = \{1, 2, \{3, 4\}, 5\}$.
The statement ${3, 4} \subset A$ is incorrect.
Reasoning: For ${3, 4} \subset A$ to be true,every element of the set ${3, 4}$ must be an element of $A$.
Here,the elements of ${3, 4}$ are $3$ and $4$.
However,$3 \notin A$ and $4 \notin A$.
Instead,the set ${3, 4}$ is an element of $A$,which is written as ${3, 4} \in A$.