GKFix MCQ Question

Why are trihalides of Group 15 elements (except BiF₃) predominantly covalent?

• A. All trihalides are ionic
• B. The elements have high electronegativity difference with fluorine only
• C. Trihalides of Group 15 elements (except BiF₃) are predominantly covalent due to high polarising power of central atom
• D. They form network solids