The correct answer is option 3, Tamil Nadu. The Syed Mushtaq Ali Trophy is a domestic Twenty20 cricket tournament in India. It is named after the Indian cricketer, Syed Mushtaq Ali. The tournament was first held in 2006-07 and is organized by the Board of Control for Cricket in India (BCCI).

Uttar Pradesh (option 1), Punjab (option 2), and Baroda (option 4) are all cricket teams that participate in the Syed Mushtaq Ali Trophy, but they were not the winners in 2021.

Tamil Nadu, on the other hand, emerged as the champions of the 2021 edition of the Syed Mushtaq Ali Trophy. The team performed exceptionally well throughout the tournament, winning all their matches in the group stage and then defeating Baroda in the final to clinch the title. Tamil Nadu showcased great skills and teamwork to secure their victory and be crowned as the winners of the Syed Mushtaq Ali Trophy for the year 2021.