Which Number Should Be Placed in the Spot Presently Filled

Which number should be placed in the spot presently filled with the X? Item ABC-Level 1
1
2
3
4
Gross Requirements
20
20
50
30
Schedule Receipts
25
Projected on Hand Inventory
30
10
15
40
10
Net Requirements
Planned Order Releases
X
Q = 25; LT = 2; SS = 10

A) 50
B) 75
C) 10
D) 20