Step 1: Identify common spelling pattern.
The correct spelling “Foreign” follows the “-eign” pattern, as in “sovereign.”
Step 2: Check each option.
- Option (a) “Foreign” — correct spelling.
- Option (b) “Foreine” — extra “e,” incorrect.
- Option (c) “Fariegn” — misplaced letters, incorrect.
- Option (d) “Forein” — missing “g,” incorrect.
\[
\boxed{\text{(a) Foreign}}
\]