But does everyone on earth have an equal right to an equal share of its resources? The spaceship metaphor can be
dangerous when used by misguided idealists to justify
suicidal policies for sharing our resources through
uncontrolled immigration and foreign aid. In their
enthusiastic but unrealistic generosity, they confuse the
ethics of a spaceship with those of a lifeboat.
Which of the following best explains why the author uses words such as
'dangerous, suicidal' and 'uncontrolled in this passage?

A. To establish his credibility
B. To attack the people who agree with him
C. To present a logical argument
D. To appeal to the reader's hotions