Sentence Correction Directions: The questions numbered 21 through 25 consist of a number of sentences, in each of which some part of the whole is underlined. Each sentence is following by four alternative versions of the underlined portion. Select an alternative you consider both most correct and most effective according to the requirements of standard written English. Answer ' $A$ ' is the same as the original version; if you think the original version is the best, select answer 'A'. In considering the answer choices, be attentive to matters of grammar, diction, and syntax, as well as clarity, precision, and fluency. Do not select an answer, which alters the meaning of original sentence.