Final answer:
Among the options provided, Catherine the Great's influence was most directly felt by Alexander I, who continued the efforts at modernization and reform in Russia. While she did lay the foundations for future rulers, her direct influence waned over time, particularly during the reign of Nicholas II. The correct option is 1.
Step-by-step explanation:
The individual who was influenced by Catherine the Great in the future was Alexander I. Catherine the Great was an 'enlightened despot', whose policies and actions laid the groundwork for future Russian rulers. Following Catherine's efforts to modernize and westernize Russia, tsars continued to attempt reforms.
Alexander II, her grandson, for example, is known for his extensive reforms including the emancipation of the serfs. On the other hand, Nicholas II, the last Tsar, resisted the forces of modernity like his predecessors and continued ruling with nearly complete authority, which eventually contributed to the fall of the Russian monarchy amidst war and revolution.
Given this, it's clear that Catherine the Great's influence extended to her immediate successors but less so to later tsars such as Nicholas II.