Sentence 1: Ben wanted a new carpet. 
 Sentence 3: His friend recommended white 
 Sentence 4:  So Ben had a white carpet installed 
 Sentence 5:  But he found that it was difficult to keep looking clean 
 Option 1: But he could not decide which color to buy. 
 Option 2: But he could not decide which color to buy but didn't get a white carpet.