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The specific rotation ${ [\alpha ] }_{ D }$ of (1S, 2R)-ephedrine HCl salt in water is ${ -32.5 }^{ \circ }$ at ${ 22 \space }^{ \circ }C$.

What is the optical rotation $α$ of a mixture of $0.25 \space g/mL \space$ (1R, 2S)-ephedrine HCl salt AND $0.25 \space g/mL \space$ (1S, 2R)-ephedrine HCl salt in water measured using a 10-cm pathlength tube under the same condition?

A

${ -32.5 }^{ \circ }$

B

${ +16.5 }^{ \circ }$

C

${ -16.5 }^{ \circ }$

D

${ 0 }^{ \circ }$

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