Which of the following is a critical factor in enhancing entrepreneurship?

A) Restricting entrepreneurship at the regional level
B) Discouraging entrepreneurs from expressing competitiveness
C) Reducing restrictions that block the flow of finance
D) Removing programs based on "learning by doing"

Removing restrictions that block the flow of finance is a critical factor in enhancing entrepreneurship, as access to funding is crucial for starting and growing a business. This allows entrepreneurs to invest in their ideas and expand their businesses, ultimately driving economic growth. Restricting entrepreneurship, discouraging competitiveness, and removing programs based on "learning by doing" all have negative effects on entrepreneurship and hinder its effectiveness.