What difficulties did the zulu encounter in fighting the british?
a
there were outnumbered
b
the british weapons were far superior
c
the british had us aid
d
the british knew the land better

The best answer is B.

 Though the Zulus had some success in driving back the British in the very first stages, the superior weapons and horses of their enemies eventually led to the rapid defeat of the Zulu.
The British forces  not only possessed cavalry and artillery, but they had also been equipped with the newest and finest weapon for infantry soldiers at the time. This weapon was the Martini Henry .45 caliber breach loading rifle.
This coupled with cavalry enabled the British not only to have superior destruction ability, but also could  deploy much more rapidly than the Zulus who fought on foot.