Sentence 1: Bob was deciding on a college major. 
 Sentence 3: He narrowed it down between those two 
 Sentence 4:  Both of these offered the best career prospects 
 Sentence 5:  He was still a freshman but knew his future would be prosperous 
 Option 1: He was debating between philosophy and interpretive dance. 
 Option 2: He was debating between engineering and computer science.