Answer
The answer is (3)
Work Step by Step
The problem asks for the resultant vector of $\overrightarrow{A}-\overrightarrow{B}-\overrightarrow{C}$
Keep in mind that the resultant of vector addition is drawn from the tail of the first vector to the head of the last vector. The subtraction of a vector is treated as the addition of a vector that has been multiplied by a scalar factor of -1.
The only correct picture is (3)
