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How the addition of impurity in pure metal affects the critical solved shear stress?

How the addition of impurity in pure metal affects the critical solved shear stress? Correct Answer Increases

The presence of an impurity in the lattice will hinder the free movement of dislocation. This result in an increase in critical resolved shear stress. The data shows the importance of small amounts of impurities in increasing the critical resolved shear stress for silver and copper.

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Which one of the following options is correct?
From an alloy, two specimens are machined and tested separately under tension and compression. The engineering stress-strain curves as well as the true stress-true strain curves for tension and compression are plotted in the same diagram. Identify the correct statements:
P. The engineering stress-strain curves in tension and compression are identical.
Q. The true stress-true strain curve in compression is lower than the true stresstrue strain curve in tension due to Bauschinger effect.
R. The true stress-true strain curve in tension is above the corresponding engineering stress-strain, curve.
S. The true stress-true strain curve in tension and compression are identical.