Which Spanish writer of the Generation of '98 wrote the existentialist novel 'Niebla' and philosophical work 'The Tragic Sense of Life'?

• A Pio Baroja
• B Miguel de Unamuno ✓
• C Azorin
• D Antonio Machado

Unamuno was a philosopher, novelist, and rector of the University of Salamanca, exploring themes of mortality, faith, and identity in his works.