5. Given a regular hexagon $A B C D E F$, which of the following expressions for $\overrightarrow{A C}$ are correct: (1) $\overrightarrow{B C}+\overrightarrow{C D}+\overrightarrow{E C}$;
(2) $2 \overrightarrow{B C}+\overrightarrow{D C}$;
(3) $\overrightarrow{F E}+\overrightarrow{E D}$;
(4) $\overrightarrow{B C}-\overrightarrow{B A}$, the number of correct expressions is ().
A. 1
B. 2
C. 3
D. 4
5. D.
(1) $\overrightarrow{B C}+\overrightarrow{C D}+\overrightarrow{E C}=\overrightarrow{B D}+\overrightarrow{E C}=\overrightarrow{A E}+\overrightarrow{E C}=\overrightarrow{A C}$; (2) $2 \overrightarrow{B C}+\overrightarrow{D C}=\overrightarrow{A D}+\overrightarrow{D C}=\overrightarrow{A C}$;
(3) $\overrightarrow{F E}+\overrightarrow{E D}=\overrightarrow{F D}=\overrightarrow{A C}$; (4) $\overrightarrow{B C}-\overrightarrow{B A}=\overrightarrow{B C}+\overrightarrow{A B}=\overrightarrow{A C}$.