In this question, you are given a sentence. A part of the sentence is underlined. This is followed by four ways of phrasing the underlined part. Choice (1) repeats the original; the other three are different. Select the version that best rephrases the underlined part It is difficult to diagnose malaria because its first symptoms are similar to any viral fever.
This choice clearly compares the symptoms of malaria to those of a viral fever, using "those" to refer to the symptoms. It is the most concise and grammatically correct option. The correct answer is (B): Are similar to those of any viral fever