Natalie had random hand movements when she was 2 months old. When she was 6 months old, she would grab a block with her whole hand. Now at the age of 10 months, she can grasp the same block with her thumb and forefinger. This sequence of growth in her hand and finger movements is occurring according to the ________ pattern.
a. Lateralization
b. Proximodistal
c. Endarch
d. Cephalocaudal