Question - Conversion between Roster Form and Set-Builder Notation

\begin{align*} A &= \{1, 3, 5, 7, 9\} \text{ in set-builder notation is } A = \{ x | x \text{ is an odd number less than 10} \}. \end{align*}

\begin{align*} B &= \{a, e, i, o, u\} \text{ in set-builder notation is } B = \{ x | x \text{ is a vowel in the English alphabet} \}. \end{align*}

\begin{align*} C &= \{2, 4, 6, 8, 10\} \text{ in set-builder notation is } C = \{ x | x \text{ is an even number less than or equal to 10} \}. \end{align*}

\begin{align*} D &= \{x | x \text{ is a prime number less than 10}\} \text{ in roster form is } D = \{2, 3, 5, 7\}. \end{align*}

\begin{align*} E &= \{10, 20, 30, 40, 50\} \text{ in set-builder notation is } E = \{ x | x = 10n, n \in \mathbb{N}, 1 \leq n \leq 5 \}. \end{align*}