which of the following occurs when monetary authorities raise the excess reserves of commercial banks? select an answer and submit. for keyboard navigation, use the up/down arrow keys to select an answer. a a fall in interest rates decreases the money supply, causing an increase in investment spending, output, and employment b a rise in interest rates increases the money supply, causing a decrease in investment spending, output, and employment c the money supply is decreased, which increases the interest rate, and causes investment spending, output, and employment to decrease d the money supply is increased, which decreases the interest rate, and causes investment spending, output, and employment to increase