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 :