North Indian powers were defeated at the hands of invaders from Central Asia because :
(a) Indian soldiers could not hope to get plunder.
(b) There was no unity among Indian soldiers due to casteism.
(c) Central Asian soldiers had more modern weapons.
(d) The invading army was led by slaves.
1. (a),(b)
2. (b),(d)
3. (c),(d)
4. (a),(c)
5.