Which of the following pairs of elements exhibits a diagonal relationship due to similar ionic radii and charge-to-radius ratios?

Elements in periodic table sometimes show similarities with elements diagonally adjacent to them in the next group, known as a diagonal relationship. This similarity arises due to comparable atomic/ionic radii and similar charge-to-radius ratios (\( \text{ionic charge} / \text{ionic radius} \)). The pairs \( \text{Li} \) and \( \text{Mg} \), \( \text{Be} \) and \( \text{Al} \), and \( \text{B} \) and \( \text{Si} \) all exhibit diagonal relationships. Therefore, all the given pairs correctly represent diagonal relationships.