Along the way, the people suffered from harsh weather, lack of food and adequate clothing, illness, and other difficult conditions. Many died and had to be quickly buried along the route.
Along the way, the people suffered from harsh weather, lack of food and adequate clothing, illness, and other difficult conditions. Many died and had to be quickly buried along the route.
It's B : The strong wind knocked down the tent; we'll have to get it up again.
A and D are run-on sentences.
C is also a run-on sentence, yet is has a comma.