Step 1: Recall infrastructure data.
Maharashtra has the largest road network in India due to its vast area, developed economy, and industrial hubs like Mumbai and Pune.
Step 2: Eliminate wrong options.
(A) Gujarat: Strong road network but not the largest.
(B) Karnataka: Not at top.
(D) Rajasthan: Large state, but Maharashtra leads in road length.
Step 3: Conclusion.
Correct answer: (C) Maharashtra.