Question 16
Refer to Passage 2 "War of the Worlds".

Which of the following best states the main (central) idea of this passage?

The main idea of this article is

A. scientists need to encourage children that science is exciting.
B. both Pluto and 2003 UB313 should be considered planets.
C. to define the number of objects in our solar system.
D. plants are incredibly difficult to find and define.