Step 1: Definition
An artifact is a human-made object of cultural or historical significance.
Step 2: Evaluate Options
- (a) Artifact: Correct. ✔
- (b) Artifect: Incorrect. ✘
- (c) Arttefect: Incorrect (extra "t"). ✘
- (d) Arrtefact: Incorrect (extra "r"). ✘
Step 3: Conclusion
The correct spelling is Artifact.
\[\boxed{\text{Answer = (a) Artifact}}\]