Task: Question Answering
Input (English): Question: Robert purchased $4000 worth of US saving bonds. If bonds are sold in $50 or $100 denominations only, which of the following CANNOT be the number of US saving bonds that Robert purchased?

 Option A: 20

 Option B: 47

 Option C: 50

 Option D: 80

 Option E: 90
Output (English): Option E