Unlike the intricate patterns of a spider's web, which are created by instinct, human architects design buildings with complex calculations and artistic vision.
✓ Correct Answer: Option C
The comparison 'Unlike X, Y...' requires X and Y to be logically comparable items. The original sentence incorrectly compares 'patterns' (of a web) to 'human architects.' Option C correctly compares 'patterns' to 'the designs of human architects.'