Evaluate the following statements related to group 14 elements for...

Evaluate the following statements related to group 14 elements for their correctness. (A) Covalent radius decreases down the group from ($\mathrm{C}$) to ($\mathrm{Pb}$) in a regular manner. (B) Electronegativity decreases from ($\mathrm{C}$) to ($\mathrm{Pb}$) down the group gradually. (C) Maximum covalance of ($\mathrm{C}$) is 4 whereas other elements can expand their covalance due to presence of d orbitals. (D) Heavier elements do not form ($\mathrm{p} \pi-\mathrm{p} \pi$) bonds. (E) Carbon can exhibit negative oxidation states. Choose the correct answer from the options given below :