Given below two statements, one is labelled as Assertion A and the other is labelled as Reason R:

Assertion A: The NEO-PI-R does not have a response style scale
Reason R: NEO-PI-R developers argued that adjustment of social desirability leads to reduction in validity 

In light of the above statements, choose the most appropriate answer from the options given below:

Correct option is A

Assertion A: The NEO-PI-R does not have a response style scale. This statement is true, or at least historically accurate. While some researchers have developed potential validity scales from existing NEO-PI-R items (like the Positive Presentation Management (PPM) and Negative Presentation Management (NPM) scales), the official NEO-PI-R manual and original design did not include such scales.
Reason R: NEO-PI-R developers argued that adjustment of social desirability leads to reduction in validity. This statement is also largely true. The authors of the NEO-PI-R have argued that there's no evidence that adjustments based on social desirability scales increase the predictive validity of the personality scales.

The assertion and the reason are both factually supported by research on the NEO-PI-R. The developers' argument against the utility of social desirability scales in improving the instrument's validity (Reason R) provides a potential explanation for their decision not to incorporate such scales into the NEO-PI-R's design (Assertion A).