Step 1 — Understand the word:
The word punctilious is used to describe someone who pays great attention to detail, especially in observing rules, codes of conduct, or formalities.
Step 2 — Interpret the nuance:
A punctilious person is extremely careful and precise, making sure that even small details are correct and proper. It often applies to manners, behavior, or carrying out tasks with exactness.
Step 3 — Find the synonym:
The word meticulous also means showing great attention to detail and being very careful and precise. Both words highlight carefulness and accuracy in action or thought.
Step 4 — Fit in the context:
Thus, punctilious and meticulous are similar in meaning, as they both imply thoroughness and precision.
Final Answer:
The correct option is (C) : Meticulous.