A readers response or comment about a text written directly on the text

Which of these statements would be most important to include in an objective summary of the article? (a)smartphone companies are searching for new ways to innovate and new services to provide to improve sales. (b) smartphones with screens that unfold like a wallet to increase display size are a sure way to build consumer excitement. (c) the top models of phones made by apple and samsung are available for ridiculous prices of more than $1,000. (d) apple's shares dropped 10 percent in stock market value after the company announced that it expects to sell fewer phones.