There is actually 3 answers A. Natural resources C. Labor E. capital will be those 3 answers. Hope this helps :)
The four types of trenches used by the Allies were:
1) Front-line Trench or Firing-and-Attack Trench
2) Support Trench
3) Reserve Trench
4) Communication Trenches
There were 4 people who took part in creating the bike. Their names are
Kirkpatrick Macmillan
Pierre Lallement
Marius Olivier
Pierre Michaux
