Answer:
A. A central bank provided direct control over all interest rates, facilitating the control and direction of the overall economy.
Explanation:
Rapid economic growth will require businesses and the economy to have unfettered access to funds and structures that will facilitate growth. Formation of corporations that will help with funding, the central bank giving out loans to businesses and forming private banks, and encouraging flow of funds from savers to enterpreneurs are ways in which economic growth is boosted.
However if a central bank provides direct control over all interest rates, facilitating the control and direction of the overall economy, it will limit economic growth.