A. Title

$\underline{\text{Example:}} \; abc\dots$

\[\begin{aligned} \text{i)}\;& \underline{\text{A}}, && \text{if } abc, \quad \forall x \in \mathbb{R}. \\ \text{ii)}\;& \underline{\text{B}}, && \text{if } abc, \quad \forall x \in \mathbb{R}. \end{aligned}\]