Answer:
A). An atom is like the solar system; there is a center around which everything revolves.
Step-by-step explanation:
An analogy is a literary device that involves the comparison of things that have resemblance or equivalence in explanation. The authors employ simile and metaphor as common forms of analogy aiming to convey the meaning of an obscure thing by comparing it to a familiar thing that assists the readers to better understand and relate the meaning of the word. Similarly, in the given question the option that offers a complete analogy is option A as it compares an obscure thing 'atom' to 'solar system'(familiar thing) to convey its meaning comprehensively. The other options are offering similes which are merely a form of an analogy. Thus, the correct answer is option A.