Which one is correct?

As discussed in our MRP section of the course, let's say it is week 1 and there are currently 100 As in stock. We need 475 As at the start of week 5 . If there are scheduled receipts planned for week 3 of 35 As and week 4 of 40As, and A has a lead time of 3 weeks, when and how large of an order should be placed to meet the requirement of 475 As at the start of Week 5 ? Week 1, 175 As Week 2, 275 As Week 4,75 As Week 2, 300 As Week 3, 300 As