Directions: Look at the four letters (A, B, C, and D) that show where the sentence below could be inserted in the passage in Paragraph 5. All that a species needs to do is to take advantage of the opportunity presented by a wildfire. Which letter shows where the sentence would best fit? A third vector for favoring a species is the transformation of the environment itself. This may bring about the proper conditions to have a species thrive and dominate in a short time. The species might be a local one, or it could be non-native. Either way, a short and massive takeover of a specific area, known as a niche, makes the species invasive. (A) Wildfires clear a habitat quickly, for example, and they leave many niches open for domination. (B) Old growth forests tend to be fairly stable, as large trees dominate the use of ground, sunlight, and nutrients. (C) After a wildfire, however, all three elements are available to the first species that is able to make inroads in the area. (D) Floods, landslides, and other natural phenomena can have a similar niche-clearing effect.