Step 1: Meaning of the word
An artifact is an object made by a human being, often of cultural or historical interest.
Step 2: Check each option
- (a) Artifact: Correct spelling. ✔
- (b) Artifect: Incorrect spelling. ✘
- (c) Arttefect: Extra “t” makes it wrong. ✘
- (d) Arrtefact: Extra “r” makes it wrong. ✘
Step 3: Conclusion
The correctly spelt word is Artifact.
\[
\boxed{\text{Answer = (a) Artifact}}
\]