求助！阅读240的一道主旨题！！百思不得其解（地球生命起源）
In 1995 the Galileo spacecraft captured data about Jupiters atmosphere—namely, the absenceof most of the predicted atmospheric water—that challenged prevailing theories about Jupiters
structure. The unexpectedness of this finding fits a larger pattern in which theories about
planetary composition and dynamics have failed to predict the realities discovered through
space exploration. Instead of normal planets whose composition could be predicted by theory,
the planets populating our solar system are unique individuals whose chemical and tectonic
identities were created through numerous contingent events. One implication of this is that
although the universe undoubtedly holds other planetary systems, the duplication of the
sequence that produced our solar system and the development of life on Earth is highly
unlikely.
Recently planetary scientists have suggested that the external preconditions for the
development of Earth’s biosphere probably included four paramount contingencies. First, a
climate conducive to life on Earth depends upon the extraordinarily narrow orbital parameters
that define a continuously habitable zone where water can exist in a liquid state. If Earths orbit
were only 5 percent smaller than it is, temperatures during the early stages of Earths history
would have been high enough to vaporize the oceans. If the Earth-Sun distance were as little
as 1 percent larger, runaway glaciation on Earth about 2 billion years ago would have caused
the oceans to freeze and remain frozen to this day. Second, Jupiter’s enormous mass prevents
most Sun-bound comets from penetrating the inner solar system. It has been estimated that...
third...
1. The passage is primarily concerned with
A. enumerating conditions that may have been necessary for a particular development
B. outlining the conditions under which scientists may be able to predict certain events
C. explaining how a particular finding affected scientists understanding of a phenomenon
D. suggesting reasons why a particular outcome was more likely to occur than other possible
outcomes
E. assessing the relative significance of factors that contributed to a particular occurrence
答案A；
D为啥不对？
D suggesting reasons why a particular outcome was more likely to occur than other possible outcomes
A是对的很明显，但是D很迷惑？ 地球产生依靠abcde多个原因，所以有这个结果而不是其他的，也说明它不可复制。正是因为这几个原因才导致了地球的产生而不是产生其他结果，所以说它不可复制。
我的理解或者逻辑是不是有啥问题.. ..... T T
求助！！！感激不尽！！ 抱歉发错版了 ... ... {:1_1:}
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