Kilian Jornet is very talented ____ running on mountains.

Kilian Jornet is very talented ____ running on mountains.

• A. At
• B. In
• C. On
• D. With

Answer: (A)

The main idea here is how we pair "talented" with the way we talk about abilities in doing something. When someone is skilled in an activity, we use "talented at" followed by the gerund for the activity. So for running, the natural phrasing is "talented at running," even when you add a place or setting afterward, as in "on mountains." The other prepositions don’t express that skill in the activity correctly: "in" would sound off because it points to a field or area rather than the act itself, "on" would misfocus on the location rather than the ability, and "with" would imply using a tool or having a trait rather than ability in the activity. So the correct form is "talented at running on mountains."

The main idea here is how we pair "talented" with the way we talk about abilities in doing something. When someone is skilled in an activity, we use "talented at" followed by the gerund for the activity. So for running, the natural phrasing is "talented at running," even when you add a place or setting afterward, as in "on mountains." The other prepositions don’t express that skill in the activity correctly: "in" would sound off because it points to a field or area rather than the act itself, "on" would misfocus on the location rather than the ability, and "with" would imply using a tool or having a trait rather than ability in the activity. So the correct form is "talented at running on mountains."