The correct answer is A. Carbon.
Electronegativity is the ability of an atom to attract electrons to itself. It is a measure of the tendency of an atom to attract electrons towards itself when it forms a chemical bond. The higher the electronegativity of an atom, the more strongly it attracts electrons.
Carbon has the highest electronegativity of the four elements listed. This is because carbon has a small atomic radius and a high electronegativity. The small atomic radius means that the electrons in carbon’s valence shell are closer to the nucleus, which makes them more strongly attracted to the nucleus. The high electronegativity means that carbon
has a strong attraction for electrons.Silicon has a lower electronegativity than carbon. This is because silicon has a larger atomic radius than carbon. The larger atomic radius means that the electrons in silicon’s valence shell are further from the nucleus, which makes them less strongly attracted to the nucleus.
Lead and tin have even lower electronegativities than silicon. This is because lead and tin have even larger atomic radii than silicon. The even larger atomic radii mean that the electrons in lead and tin’s valence shells are even further from the nucleus, which makes them even less strongly attracted to the nucleus.
Therefore, carbon has the highest electronegativity of the four elements listed.