What was the name Koch's father's company?
| Options: |
| A) Rock Island Oil Company B) City Oil & Refining Company C) Rock Island Oil & Refining Company D) Rock Island Company |
| Answer : Rock Island Oil Company |
| Options: |
| A) Rock Island Oil Company B) City Oil & Refining Company C) Rock Island Oil & Refining Company D) Rock Island Company |
| Answer : Rock Island Oil Company |