Eight-month-old gina finds that when she pulls on the cord at the side of her playpen, her jumping jack goes up and down and so she pulls the cord repeatedly. gina's action in scenario is characteristic of the substage of

Gina's action in scenario is characteristic of the substage of "secondary circular reactions".
In the substage of Secondary Circular Reactions, newborn children take significant walks in moving their psychological horizons beyond themselves and start to follow up outwardly world. This substage starts from four months of age to eight months.

C option is correct