What Were the Findings of the Joint Attention Study of Brooks

What were the findings of the joint attention study of Brooks & Meltzoff (2005) ?

A) Infants under 10 months will follow head turns only if the eyes are also open.
B) Infants under 10 months will follow head turns both if the eyes are open or closed.
C) Infants under 10 months will point to a novel object that the experimenter cannot see.
D) Infants under 10 months don't engage in joint attention.