My brother likes sandboarding and windsurfing, as ____ give him the opportunity to rely on his own skills and abilities.

My brother likes sandboarding and windsurfing, as they give him the opportunity to rely on his own skills and abilities. Объяснение: В данном контексте местоимение "they" (они) относится к видам спорта (sandboarding и windsurfing), которые дают ему возможность полагаться на свои навыки.