ক. Had she studied hard ✔
খ. If she studied hard
গ. If she has studied hard
ঘ. Has she studied hard
ব্যাখ্যা: Main clause---এ 'could have topped' থাকায় Third Conditional অনুযায়ী 'Had + subject + V3' (Had she studied) গঠনটি সঠিক।
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