In one or two paragraphs describe the spread of Islam into western Africa what factors helped the religion spread in the region

What does it signify if point 1 shifts down and to the right? a. the price level and the real gdp are falling. b. the real gdp is falling, and supply is increasing. c. the price level is rising, and production is increasing. d. the price level is falling, and demand and the real gdp are rising.