Pirmin's Bike Shop is behind on a custom bike and needs to crash 8 hours of time from the 8-step project. Given the project table below calculate the crash cost for 8 hours of time-savings. Suppose Pirmin calls the customer and asks for a project extension, reducing the amount of time he needs to crash.

Activity	Normal Duration (hours)	Normal Cost ($)	Crash Duration (hours)	Crash Cost ($)	Immediate Predecessors
A	2	10	2	50	-
B	3	15	2	23	A
C	5	25	4	30	B
D	3	20	1	24	C
E	6	30	4	45	C
F	1	5	1	50	C,E
G	7	35	6	50	F
H	10	50	7	80	D,G

a. What is the critical path? [ Select ] ["A,B,C,E,F,G,H", "A,B,C,D,E,F,G,H", "A,B,C,D,H", "A,B,C,F,G,H"]

b. What is the project length? [ Select ] ["23 hours", "15 hours", "34 Hours", "35 hours"]

c. Which activity should the bike shop crash first [ Select ] ["C", "B", "E", "D"] , and how much would it add to the project cost? [ Select ] ["$7.50", "$10", "$2", "$5"]

d. Which activity should be crashed next to reduce an additional hour off the project [ Select ] ["D", "C", "E", "NONE"] , and what would be the total cost? (reducing the project by 2 hours) [ Select ] ["$15.75", "$12.50", "$14.50", "$5"]