Final answer:
Option C, where Vladimir plans to earn enough money to buy a house for his mother, best demonstrates conscious mental processes, as it requires deliberate, rational thinking and careful planning.
Step-by-step explanation:
The best demonstration of conscious mental processes is when an individual engages in clear, deliberate, and rational thinking, particularly for new or challenging tasks that are outside their automatic routines or skills.
In the context of the given options, Option C, where Vladimir makes a plan to earn enough money to buy a house for his mother, best demonstrates conscious mental processes. This option involves deliberation, planning, and rational thinking. Vladimir must consciously consider various factors such as his income, expenses, savings plans, and the real estate market, all of which require the engagement of deliberate and rational thought.