Based on the advertisements and the details about each person, here are the best roles for each individual:

1. **Andy**: He is a caring person and often helps the elderly. **Best role: A - Gardener** (working with people and helping them with their gardens would suit his caring nature).

2. **Gina**: She enjoys drawing and painting. **Best role: C - Assistant in Art Shops** (this involves arranging artwork and talking to customers, which fits her interests).

3. **Nancy**: She can play different musical instruments and sing beautifully. **Best role: D - Artist for Talent Shows** (this role involves musical talent and performing, which aligns with her skills).

4. **Luke**: He is friendly and enjoys doing sports. **Best role: B - Sports Coach** (encouraging children in sports fits well with his friendly personality and interest in sports).