Answer:
A - The A-not-B error.
Explanation:
This error, also known as perseverative, is mostly seen in infants around one year. By the time their are around 8 months they realize that objects that are hidden have still not dissapeared. It represents the ability that a child hass to represent said object in their mind. In this case, Ramy knows that the object still exists even if it's under a blanket. He will first look for it where he had founded it before even if he sees it's not there.