GKFix MCQ Question

Why is the SN2 reaction of CH3I faster than that of (CH3)3CCH2I?

• A. CH3I has a better leaving group
• B. (CH3)3CCH2I forms a more stable carbocation
• C. CH3I has less steric hindrance around the reacting carbon
• D. (CH3)3CCH2I is more polar