A study estimated the following infant mortality equation using a sample of 20 OECD countries from 1960 to 1985. They obtain the following (abbreviated) results:

where

IMR = infant mortality rate for each country for each year

TIME = time trend

RGDP = real GDP per capita for each country for each year

PHYS = number of physicians per capita for each country for each year

URBAN = percentage of the population in urban areas in each country in each year

FLPR = female labor force participation rate in each country for each year

ED = level of education in each country for each year

Based on their findings, what can we conclude about the relationship between realGDP per capita and infant mortality?

a.Each additional dollar of real GDP decreases the infant mortality rate by 0.892, given all else equal.

b.Each additional dollar of real GDP decreases the infant mortality rate by 0.892 percent, given all else equal.

c.If real GDP increases by 1%, the infant mortality rate decreases by 0.892 percent, given all else equal.

d.If real GDP increases by 1%, the infant mortality rate decreases by 0.892, given all else equal.