IMAT 2017 Q4 [Postal Charges]

I recently received a publications list and order form. I want to order seven items from the list. However, I noticed that the structure of the postage and packaging charges was very strange, as shown in the table below:

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I have decided that I will ask them to pack my order in the number of parcels that will have the lowest postal charge.

What is the lowest postal charge for my seven items?

A. £1.90
B. £2.45
C. £3.30
D. £2.35
E. £2.25