Among the statements $(a)-(d)$ the correct ones are
$(a)$ Lithium has the highest hydration enthalpy among the alkali metals.
$(b)$ Lithium chloride is insoluble in pyridine.
$(c)$ Lithium cannot form ethynide upon its reaction with ethyne.
$(d)$ Both lithium and magnesium react slowly with $H_2O$.

• A
  $(a), (c)$ and $(d)$ only
• B
  $(b)$ and $(c)$ only
• C
  $(a), (b)$ and $(d)$ only
• D
  $(a)$ and $(d)$ only