Explanation
{\textbf{Hint: Use Triangle Law of vector addition}}
{\textbf{Step 1: Find the resultant of two vetors}}
\Rightarrow \overrightarrow {AB} + \overrightarrow {BC} = \overrightarrow {AC}
{\textbf{Step 2: Solve the vector sum and Compare with the options}}
\overrightarrow {AB} + \overrightarrow {BC} - \overrightarrow {AC} = \overrightarrow 0
{\Rightarrow}\overrightarrow {AB} + \overrightarrow {BC} + \overrightarrow {CA} = \overrightarrow 0
{\Rightarrow}\overrightarrow {AB} - \overrightarrow {CB} + \overrightarrow {CA} = \overrightarrow 0
{\text{But }}\overrightarrow {AB} + \overrightarrow {BC} - \overrightarrow {CA} \ne \overrightarrow 0
{\textbf{Final Answer: Option (C) is incorrect}}
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