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Consider the following curve:

$${ x }^{ 5 }-{ 4x }^{ 3 }+{ 3x }^{ 2 }+19x+15$$

It is concave down in all following regions except

A

$x<-1.5$

B

$ 0.3 < x < 0.5$

C

$ -1.8 < x < -1.6$

D

$ 0.9 < x < 1.1$

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