The correct option is
D Conversion of angiotensinogen to angiotensin-I
The function of renin is to convert angiotensinogen to angiotensin I and
further to angiotensin II in response to fall in glomerular blood
flow/glomerular blood pressure/GFR. Angiotensin II, being a powerful
vasoconstrictor, increases the glomerular blood pressure and thereby
GFR. It also activates adrenal cortex to release aldosterone.
Aldosterone causes reabsorption of Na+ and water from distal
parts of the tubule. This also leads to an increase in blood pressure
and GFR.
So, the correct answer is 'Conversion of angiotensinogen to angiotensin-I'.