Altering the radii of the afferent and efferent arterioles provides for
-blood pressure homeostasis and glomerular filtration rate homeostasis
-glomerular hydrostatic pressure homeostasis
-glomerular filtration rate homeostasis
- blood pressure homeostasis
-glomerular filtration rate homeostasis and glomerular hydrostatic pressure homeostasis

- glomerular filtration rate homeostasis and glomerular hydrostatic pressure homeostasis

Explanation:

Glomerulus receives blood from Afferent arteriole and blood is take away from glomerulus by efferent arteriole. Glomerulus or glomerular capillaries are  similar to blood capillaries but are more permeable due to fenestration or pores. The mechanism of urine formation involves three steps of which the first step is glomerular filteration or ultrafilteration. Glomerular flteration depends upon 3 main pressures:

a. glomerular blood hydrostatic pressure (GBHP).

b. capsular hydrostatic pressure

c. blood colloidal osmotic pressure

GBHP is the natural arterial pressure, occurs due to wider diameter of afferent compared to efferent arteriole. GBHP is around 60 mm of Hg. Altering the radii of afferent or efferent arteriole would alter the the glomerular filtration rate by changing the glomerular hydrostatic pressure.