Grammar: Sentence Correction and Pronoun Usage

<span class="Apple-style-span" style="font-size:" small;=""><span style="font-size:10.0pt;font-family:Arial;mso-fareast-font-family:"Times" new="" roman";color:black;mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa="">Directions:<span style="font-size:10.0pt;font-family:Arial;mso-fareast-font-family:"Times" new="" roman";color:black;mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa=""> This question presents a sentence, all or part of which is underlined. Beneath the sentence you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.

Like their counterparts in other countries, the student movement in the United States in the 1960s was a powerful one and probably helped to bring the war in Vietnam to an end.