Final answer:
A deeper understanding of George Bernard Shaw's 'Pygmalion' is gained through knowledge of the play's use of metaphor, which provides insight into Shaw's critique of societal superficiality and class distinctions. Thus, option B is correct.
Step-by-step explanation:
To better understand the deeper meaning of George Bernard Shaw's Pygmalion, audiences would benefit most from knowledge of b. the play's use of metaphor. Engaging with the metaphorical content and thematic elements allows audiences to grasp the complex social and ethical discussions presented in the play. Shaw uses the transformation of Eliza Doolittle, the flower girl, into a refined lady as a commentary on the superficiality of society and its class distinctions, an idea that transcends the specificity of the play's Edwardian London setting.
Furthermore, understanding the concept of metaphor provides insight into how the play comments on broader human experiences and societal norms. Shaw's use of sharp wit and engaging dialogue conveys his critical view on the social issues of his time, such as class inequality and gender roles. While knowledge of Shaw's other plays or the original Pygmalion myth may enrich the experience, it's the recognition of the use of metaphor that is most essential to uncovering the play's rich, multi-layered social critique.