Task: Question Answering
Input (English): Question: Peter invests a sum of money and gets back an amount of $ 830 in 3 years . David invests an equal amount of money and gets an amount of $854 in 4 years. If both amounts were invested at the same rate (simple interest ) What was the sum of money invested ?

 Option A: 670

 Option B: 664

 Option C: 698

 Option D: 758

 Option E: 700
Output (English): Option D