Faulty parallelism is a construction in which two or more parts of a sentence are roughly equivalent in meaning but not parallel (or grammatically similar) in form. Faulty parallelism most often occurs with paired constructions and items in a series.
Fire would be the answer. The car needs gas to burn. The fire needs wood to burn.
The correct answer to this question is letter "<span> b: to imply the main idea of the article." </span>in these days we can kindle a fire without any trouble, because we can easily get a match. The purpose of this line from the text in order <span> to imply the main idea of the article.</span>