The correct option is A (a) p,q,t; (b) p,t; (c) s, t; (d) r, s, t
All the elements belong to the alkaline earth metals (s-block).
From the given alkaline earth metals, Be exhibits a diagonal relationship with Al.
Likewise, Mg displays diagonal relationship with Li.
Like alkali metals, both Ca and Sr are soluble in liquid ammonia.
Be2+ has the highest hydration enthalpy. This can be explained by the smallest
ionic radius and thus the highest charge density (among the given ions).
The extent of hydration and also the hydration sphere is the largest for Be++.
Sr++ has the lowest charge density ⇒ lowest hydration sphere radius.