Isha and Tybere Are Both 10 Months Old

Isha and Tybere are both 10 months old. Isha is considered an "experienced" crawler whereas Tybere is not. When placed at the top of a steep flight of stairs, it is most likely that

A) Isha would confidently attempt to crawl down the stairs, but Tybere would stay on the landing.
B) Tybere would attempt to crawl down the stairs, but Isha would remain on the landing.
C) both infants would remain on the landing.
D) both infants would confidently crawl down the stairs.
E) both infants will crawl down the stairs, but Isha would move more quickly.