The Brahmayajna included in the list of five Mahayajnas signifies:

Correct option is A

The best answer is the Brahmayajna, included in the list of five Mahayajnas (Panchamahayajnas), primarily signifies The study of Vedic lore.

Brahmayajna (also known as Rishi Yajna or Veda Yajna) is considered a duty owed to the ancient sages (Rishis) who preserved and transmitted the Vedic knowledge.
The main practice associated with it is svadhyaya, which involves the daily study, recitation, and teaching of the Vedas and other sacred scriptures. This act of engaging with knowledge is considered a form of sacrifice or offering in itself.
The other Mahayajnas include: Deva Yajna (offerings to gods), Pitri Yajna (offerings to ancestors), Bhuta Yajna (offerings to all living beings), and Manushya Yajna (hospitality to guests).