What was a 'cubit' in biblical times, and how might its varying lengths have affected ancient Israelite construction and trade?

A The varying lengths of cubits had no significant impact, as all construction was divinely guided and precise regardless of human measurement. B The different cubit lengths reflected regional variations and the authority of local rulers, influencing trade agreements and construction projects, and potentially leading to disputes over measurements and value. C The cubit was a standardized unit enforced by the central government to ensure fairness in trade and consistency in building projects across all regions. D The cubit's length was determined solely by the high priest and varied based on the time of year.