A fall in glomerular filtration rate (GFR) activates

Explanation

• A fall in glomerular filtration rate (GFR) or glomerular blood pressure activates Juxta glomerular cells to release renin.
• Renin release converts angiotensin to Angiotensin I and then to Angiotensin II.
• Angiotensin II functions as a vasoconstrictor and increases glomerular blood pressure and hence increases GFR. 
• Aldosterone is a hormone secreted by the adrenal medulla which controls salt (sodium and potassium) and water content in the body. Thus, its release results in the reabsorption of sodium and water from the distal part of the tubule.
• Antidiuretic hormone or vasopressin plays an important role in regulating the water content in the body. Thus, it gets released when water loss is high or the body is dehydrating and increases water reabsorption.
• Adrenaline hormone is a stress hormone that prepares our body for the fight-or-flight response.

Final Answer

Thus the correct option is D i.e., Juxtaglomerular cells to release renin.