Step 1: Hinayāna focus.
Hinayāna (Theravāda) primarily focused on the individual's path to becoming an Arhat, leading to self-liberation. The Bodhisattva concept was absent.
Step 2: Mahāyāna concept.
The Mahāyāna tradition centers on the principle of the "Bodhisattva." A Bodhisattva postpones their own nirvana to benefit all sentient beings.
This is considered a union of compassion and wisdom.
Step 3: Other traditions.
Ājīvaka: A deterministic philosophy; no Bodhisattva concept.
Jaina: Has its own unique Tirthankara-vāda, not Bodhisattva-vāda.
Step 4: Conclusion.
The correct answer to this question is the Mahāyāna tradition.