Who is they in the following sentence?

Subways has always been considered a healthy choice by athletes, so they often visit this restaurant as regulars.

OPTIONS:
- Subways
- athletes
athletes
Vilka är de i följande mening? Tunnelbanor har alltid ansetts vara ett hälsosamt val av idrottare, så de besöker ofta denna restaurang som stamgäster. ALTERNATIV: - Tunnelbanor - idrottare
Who are they in the following sentence? Metros have always been considered a healthy choice of athletes, so they often visit this restaurant as regulars. ALTERNATIVE: - Metros - athletes
idrottare
athletes