If c is the midpoint of and d lies on , as shown below, which of the following expressions are also true? check all that apply.

Through reason as well as looking at the diagram, the given statements that bust be true are:
A. AD<DB because D is less than half way across line AB, and is closer to A than B.
B. AD<CB because CB definitely accounts for half of the line, whereas AD accounts for less than half of line AB.
D. AD+DC=CB because AD+DC= AC, and we know that both AC and CB are half of line AB.

A.
B.
C. 
I believe these are the proper answers.