**Concept: The question tests on the ability to solve a Geometry basic problem**

**Solution:**

We need to do the sum backwards

Each had $80 after the final distribution. So, the total amount of money = 80 * 4 = 320

Final: A = 80, B = 80, C = 80, D = 80

Before A gave: B = C = D = 40 (As their Amounts doubled to 80). A had 320 - (40 + 40 + 40) = 320 120 = $200

Before B gave: A = 100, C = 20, D = 20. B had 320 - (100 + 20 + 20) = 320 - 140 = $180

Before C gave: A = 50, B = 90, D = 10. C had 320 - (50 + 90 + 10) = 320 - 150 = $170

Before D gave: A = 25, B = 45, C = 85

Therefore C initially had $85

Option c