Information placed at the start or end of a text is likely
a.
less important than the information in the body, so the author wishes to de-emphasize it.
b.
to have no bearing on its significance.
c.
important, so the author wishes to emphasize it.
d.
just as important as information throughout the body of the text.

Usually, authors place important information at the start and end of a text because since the very beginning they want the reader to get familiar with the main ideas, and they also want the reader to finish reading the text with a summary of most important points. According to this, information place at the start or end of a text is likely important so the author wishes to emphasize it.