Improve Your head Position during Batting #shorts

your position in the text is shown by a

Assertion: There is no apprecible change in the position of the body during the action of the impulsive force. Reason: In case of impulsive force the time of action of the force is very short.

In the following question, out of the four alternatives, select the alternative which will improve the bracketed part of the sentence. In case no improvement is needed, select "no improvement". You must to do your assignments, (mustn't) you?