In the following passage some of the words have been deleted. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.

First, the e-commerce industry has historically struggled with (1)______ issues. The Internet has made it possible for customers to place (2) ______ from any location, but that convenience comes with a cost in (3) ______ of shipping costs and order fulfillment times. But by hosting their e-commerce sites on cloud computing platforms, merchants can offload (4) ______ of the server processing work. These third-party systems still (5) ______ full control over the look and feel of their online stores.

Select the most appropriate option to fill in blank number 4.