Final answer:
Decreased resistance of the efferent arterioles would increase glomerular filtration pressure.
Step-by-step explanation:
Glomerular filtration pressure is influenced by various factors. Among the options listed, the condition that would increase glomerular filtration pressure is a decreased resistance of the efferent arterioles. When the resistance of the efferent arterioles is decreased, blood flow from the glomerulus is reduced, leading to an increase in glomerular filtration pressure.