Direction: In the following questions some of the sentences have errors and some are correct. Find out which part of a sentence has an error. The number of that part is your answer. If a sentence is free from errors, then your answer is (4) i.e. No error.
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					 Solve the question according to given instruction
- 
                        - He walked
- ten miles
- by foot.
- No error
 
Correct Option: C
On will replace by because – 
on foot (Idiom) : running/walking (using the feet) 
Look at the examples given below : 
We go around the campus on foot. 
There’s no road to the lodge; we have to get there on foot. 
 
	