Which one is similar to Password : Account ?

Information Given:
Password : Account

Logic:  Tool used to open/access something

Password is used to access/open an account​

Step-by-step:
(A) Key : Lock ✔ (Key opens lock → same relation)
(B) Book : Library ✖ (not access relation)
(C) Foot : Shoes ✖ (wearing relation)
(D) Data : Computer ✖ (usage relation)

Final Answer:
Key : Lock

Final Correct Option:
A