Select the Letter of the Correct Answer for Each of the Following

Select the letter of the correct answer for each of the following questions. The group of sentences below could be unscrambled and written as a paragraph. Select the letter of the topic sentence in this group of sentences.

A) Some physicians use iPhones to show patients videos about their medical conditions and even procedures to be performed.
B) At New York's Museum of Modern Art, visitors can use their iPhones to get audio information about the art as they stroll the galleries.
C) Musicians can use the iPhone as a recorder or wind instrument by blowing into the microphone while touching "holes" on the screen to produce notes.
D) The iPhone, a hand-held device that functions as a phone, camera, Internet browser, and digital music player, is being used in many creative and innovative ways.