Step 1: Understanding the Question:
• We must pick the correct statements about Ala-ud-din Khalji.
Step 2: Detailed Explanation:
• A is correct: he became Sultan after killing his uncle and father-in-law Jalal-ud-din Khalji.
• B is correct: he gave important positions to his loyal officers.
• D is correct as per the NTA key: he allowed the Jalali nobles to continue in their earlier posts.
• C (releasing the queen mother Malika Jahan from prison) and E (leniency towards rebel nobles) are not accepted as correct.
• The correct statements are A, B and D.
Step 3: Final Answer:
The correct option is (B) A, B, D Only.