Select the most appropriate option to fill in the blank.
It is difficult to drink from a cup which is full to the ______.

brim

It is difficult to drink from a cup which is full to the brim.

Explanation:

• Top: This refers to the highest point or part of something, but "brim" is a more suitable word for describing the edge of a full cup.
• Edge: This refers to the outer limit or boundary of something. While it's related to the context, "brim" specifically refers to the top edge of a container, like a cup.
• Brim: This noun refers to the upper edge of a vessel or container, often used to refer to a cup that is filled to the top.
• Circumference: This refers to the distance around the edge of a circle or other curved geometric figure. It is not appropriate for describing a cup being filled. "Brim" is the correct choice here.