Given the following information on the project's net operating working capital, the cash flow of year 1 due to investments in net operating working capital is___?

Time NOWC

0 21.37

1 30.05

2 31.61

3. 20.00

Select one:

a. 8.68

b. -8.68

c. 1.56

d. -1.56

e. 11.61