In Terms of Fine Motor Development, What Should the Infant

In terms of fine motor development, what should the infant of 7 months be able to do?

A) Transfer objects from one hand to the other and bang cubes on a table.
B) Use thumb and index finger in crude pincer grasp and release an object at will.
C) Hold a crayon between the fingers and make a mark on paper.
D) Release cubes into a cup and build a tower of two blocks.