Final answer:
The quality universally necessary and sufficient for high attractiveness is symmetry. Other qualities such as intelligence and confidence affect attractiveness but are not universally determinative. Symmetry transcends cultural differences in perceived attractiveness.
Step-by-step explanation:
The question you've asked about the single quality that is a necessary and sufficient condition for high attractiveness points to the aspect of facial and body symmetry. Numerous studies emphasize that both men and women with higher levels of symmetry are generally seen as more attractive. This is considered a universal feature of attractiveness, beyond culturally influenced factors like large eyes, high cheekbones, or broad shoulders. While characteristics such as intelligence, kindness, and confidence might be attractive qualities, the only option from the given choices that has been documented as universally necessitating high attractiveness is symmetry (c).
The idea that people's ideas about themselves should align with their actions is termed congruence (d). Regarding the predictors of overall job satisfaction, work content (d) has a strong correlation. Moreover, informational social influence is more likely under conditions where the answer is unclear or the group has expertise (d. both b and c).
It's also worth noting that while physical attractiveness contributes to happiness, other factors like personality traits, such as conscientiousness and extroversion, also play significant roles in personal well-being and social success.