Chiral centers require four different substituents on a carbon atom

Steps:

• Identify all tetrahedral carbon atoms in molecule G.
• For each carbon, check if it has four distinct substituents attached.
• Count carbons meeting this criterion: three such carbons are present.
• Verify no other atoms (e.g., nitrogen) qualify as chiral centers here.

Why C is correct:

• A chiral center is defined as a stereogenic atom with four different substituents, and molecule G has exactly three such carbons.

Why the others are wrong:

• A: Underestimates by missing two chiral carbons.
• B: Underestimates by missing one chiral carbon.
• D: Overcounts by including a non-chiral carbon with two identical substituents.

Final answer: C