Step 1: Understand the preposition usage.
"Across" is used when referring to movement from one side of a space or area to the other. In this case, the child is running from one side of the road to the other. Step 2: Analyze each option.
- (A) across: Correct. "Across" fits because it implies crossing over the road.
- (B) in: Incorrect. "In" refers to being inside a place or area, not movement across it.
- (C) against: Incorrect. "Against" suggests opposition or conflict, which doesn't fit the context of running on a road.
- (D) at: Incorrect. "At" would imply being at a specific point, not running along or across it. Step 3: Conclusion.
The correct sentence is "The child ran across the road."