Consider the following processes:
1. A ----> 2B ΔH1
2. B -----> C+D ΔH2
3. E ----> 2D ΔH3
4. A ---->2C +E ΔH4

ΔH4 = ______?

a. ΔH1 + ΔH2 + ΔH3
b. ΔH1 + ΔH2
c. ΔH1 + ΔH2 - ΔH3
d. ΔH1 + 2ΔH2 - ΔH3
e. ΔH1 + 2ΔH2 + ΔH3