The launch vehicle of Mars Orbiter Mission was:

PSLV C-25

The correct answer is Option (2) - PSLV C-25

The launch vehicle used for the Mars Orbiter Mission (Mangalyaan) was PSLV C-25. PSLV stands for Polar Satellite Launch Vehicle, and C-25 refers to the specific configuration of the rocket used for this mission. PSLV C-25 successfully launched the Mars Orbiter spacecraft into orbit around Earth before its journey to Mars, marking a significant milestone for India's space exploration program.