To display "Full price ticket," the input age must not be 16 or under (which would give a "Half-price ticket") and must not be 60 or above (which would also give a "Half-price ticket").
From the flowchart, the only ages that would lead to "Full price ticket" are those between 17 and 59 years inclusive.
From the provided responses:
- 20 - would give "Half-price ticket" (Yes to Age 16 or under)
- 65 - would give "Half-price ticket" (Yes to Age 60 or above)
- 60 - would give "Half-price ticket" (Yes to Age 60 or above)
- 15 - would give "Half-price ticket" (Yes to Age 16 or under)
Since no specific age is given in your options that would lead to "Full price ticket," I can conclude that there is no correct response for the question as posed.
If the input ages available were only these options, none would lead to a "Full price ticket."