To find the total miles driven by all three trucks, you need to add the miles driven by each truck together:
- First truck: 100,042 miles
- Second truck: 98,117 miles
- Third truck: 120,890 miles
Now, let's perform the addition:
\[ 100,042 + 98,117 + 120,890 = 318,049 \]
So, the total miles driven by all three trucks is 318,049 miles.
However, it seems that the closest option given in your responses is 319,049 miles. Please double-check the options as none of them match the correct total.