The founder of the Sikh faith, Guru Nanak, was born in which region of Punjab?

The correct answer is: a) Majha.

Guru Nanak Dev Ji was born in Talwandi Rai Bhoi Di, now known as Nankana Sahib, in the Majha region of Punjab, Pakistan. The Majha region is located in the central part of Punjab and is considered to be the birthplace of Sikhism. The region is also home to many historical and religious sites, including the Golden Temple in Amritsar.

The other options are incorrect. Malwa is a region in the southern part of Punjab. Doaba is a region in the central part of Punjab. Pothohar is a region in the northwestern part of Punjab.