Ouch!" Lucy had fallen again! She shivered and picked herself back up. Then she spotted her older sister, Sarah, gliding backwards gracefully. Sarah made everything look so easy.What is Lucy doing?
a. Lucy is skating
b. Lucy is ice skating
c. Lucy is figure skating
d. Lucy is roller skating

I know because the text mentions that her sister, Sarah, is gliding backwards gracefully, which implies that they are ice skating or roller skating.