p-Block Elements: JEE Main 2026 Chemistry question

A 'p'-block element (E) and hydrogen form a binary cation $(\mathrm{EH_x})^+$, while $\mathrm{EH_3}$ on treatment with $\mathrm{K_2HgI_4}$ in alkaline medium gives a precipitate of basic mercury(II)amido-iodine. Given below are first ionisation enthalpy values ($\mathrm{kJ\,mol^{-1}}$) for first element each from group 13, 14, 15 and 16. Identify the correct first ionisation enthalpy value for element E.