Step 1: Understanding the context.
The question is based on the lesson “The Gambling Match”, which draws references from the epic Mahabharata.
Step 2: Recalling the epic details.
Madri was the second wife of King Pandu. She was the mother of the twin brothers Nakula and Sahadeva.
Step 3: Analyzing the options.
(A) Yudhishthira and Duryodhana: Incorrect, they were not Madri’s sons.
(B) Nakula and Sahadeva: Correct — they were the twin sons of Madri.
(C) Sakuni and Bhima: Incorrect and unrelated pairing.
(D) Nakula and Arjuna: Incorrect, as Arjuna was Kunti’s son.
Step 4: Conclusion.
The correct answer is (B) Nakula and Sahadeva.