If the central atom in a molecule with a perfect shape gains a lone pair, how does this affect the molecule's polarity?

• A. The molecule becomes ionic due to the presence of lone pairs.
• B. The molecule remains nonpolar because lone pairs do not affect polarity.
• C. The molecule becomes nonpolar because lone pairs increase symmetry.
• D. The molecule becomes polar due to the asymmetrical distribution of electron density.

Answer: (D)