It is a metaphor because it is comparing one thing to another.
Hello. You did not present the text to which this question refers, which makes it impossible for it to be answered accurately, but I will try to help you in the best possible way.
1. The mistake of this statement is to use the term "muscular system" and not "locomotor system." This is because the locomotor system is formed by the muscular system and the skeletal system, but people believe that this system is only related to the bones, completely ignoring the function of the muscles. Thus, the correct phrase would be: A common misconception is that the locomotor system moves only the bones.
2. Many people have this misconception because they do not really know the name of the systems, and do not know that the systems can form pairs and groups, which are named differently.
There are only three articles in the English language. One is definite, and two are indefinite. "The" is a definite article, while "a" and "an" are indefinite articles. To answer your question, you need to find the sentence that correctly uses "a" and "an". "A" is used if the word following it begins with a consonant, while "an" is used if the word following it begins with a vowel. Looking at the options provided in your particular problem, you can see that answer choice a is the only one that follows all of the above rules, making it the correct answer.
The correct answer is most like Amory