Let's analyze the sentence parts:
Step 1: Read the full sentence
Combining parts A, B, and C: "The child ran across the street without looking for oncoming traffic.''
Step 2: Identify the error
- Part (A) is grammatically correct: "The child ran across'' is a proper subject and verb phrase.
- Part (B) "the street without'' is incomplete but connects correctly to the rest.
- Part (C) "looking for oncoming traffic'' is incorrect because it implies the child did look for traffic, but the sentence says "without'' doing something.
- The correct phrase should be "looking at oncoming traffic'' or "checking for oncoming traffic.'' Also, the phrase "looking for'' means searching, which is not the right expression here.
- So, part (C) is the incorrect part because the phrase "looking for oncoming traffic'' is not appropriate after "without.'' It would be better to say "without looking at oncoming traffic.''
Step 3: Correct sentence
"The child ran across the street without looking at oncoming traffic.''
Conclusion:
The error is in part (C).