Correct Answer - Option 1 : Carpenter : Saw
In this question, 1st is the person and 2nd is the tool/instrument.
A Stethoscope is used by Doctors.
A stethoscope is a medical instrument used in listening to sounds produced within the body, chiefly in the heart or lungs.
Similarly,
A saw is used by Carpenter.
A saw is a tool used for cutting wood.
All other options are different from the given first pairs, all are objects no person.
Hence, "option 1" is the correct answer.