Part or all of the following sentence is underlined; beneath the sentence are five ways of phrasing the underlined material. Select the option that produces the best sentence. If you think the original phrasing produces a better sentence than any of the alternatives, select choice A.  

Concerned that people will click to borrow an e-book from a library rather than click to buy it, library access to the e-book forms of most major U.S. publishers' titles is blocked.