Answer:
The answer would B) 9 OUNCES
Step by step
The mountain climber eats 61.4 ounces of the trail mix in 7 days. We need to know how much he eats in just one day so we would dived.

So now we know that each day he ate 8.7714 ounces of trail mix in a day. But when we look at the options this answer is not there so we have to round the number. When we're rounding we have to look at the second number if it is 5 and under then we round down but if it is 5 and up we round up. In our case the second number is 7 so we round up which would give us 9. Therefore the answer is B