When Stravinsky came to the United States he took on an assistant conductor named: A. Leonard Bernstein. B. James Levine. C. Arturo Toscanini. D. Robert Craft

## Step 1<br />This problem is a factual question about the history of music, specifically about the life of Igor Stravinsky, a renowned composer. The question asks for the name of the assistant conductor that Stravinsky took on when he moved to the United States.<br />## Step 2<br />The options provided are Leonard Bernstein, James Levine, Arturo Toscanini, and Robert Craft. All of these individuals were significant figures in the world of music, but only one of them served as Stravinsky's assistant conductor.<br />## Step 3<br />Robert Craft was a composer and music critic who served as Stravinsky's assistant conductor when he moved to the United States. Therefore, the correct answer is D. Robert Craft.