Final answer:
Approximately 10% of the population is left-handed (Option a).
Step-by-step explanation:
Research studies and surveys consistently suggest that around 10% of the global population is left-handed (option A). This percentage has been supported by various studies conducted across different countries and cultures.
The prevalence of left-handedness is often determined through surveys and observational studies where individuals are asked about their dominant hand. It's important to note that left-handedness is not evenly distributed across all populations and may vary in different regions or groups.
The 10% estimate is a rough average, and deviations might occur based on the methodology of the study and the specific population being examined. The genetic and environmental factors influencing handedness are complex, and researchers continue to explore these aspects.
While the percentage may not be precisely 10% in every study, it serves as a reasonable approximation and is commonly accepted in scientific literature. Left-handedness remains a fascinating aspect of human variability, and understanding its prevalence contributes to our knowledge of neurobiology and genetics.