Let $f: R \rightarrow R$ be defined by $f(x) = \begin{cases} x+2, & x \leq -1 \\ x^2, & -1 < x < 1 \\ 2-x, & x \geq 1 \end{cases}$. Then the value of $f(-1.75) + f(0.5) + f(1.5)$ is
- A$0$
- B$1$
- C$2$
- D$-1$
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