Answer:
The correct answer is phosphorus-32-32.
Step-by-step explanation:
Phosphorus-32 is an isotope of phosphorus found in many organic molecules. They are used to detect metabolic pathways of involving bio-molecules. Also used to detect malignant tumors in the body of the living being.
Where as:
Carbon-14 is used for carbon-14 dating also known as radiocarbon dating. this is used to determine age of old objects.
Potassium-40 id used to determination of age of rocks and minerals. Specially used in potassium argon dating.
Rubidium-87 is an isotope of rubidium element used to determine age of rocks.