Which statement best illustrates a synthesis of ideas between these two texts?
Nadine is researching Lewis and Clark's journey West.
She has read a letter from Thomas Jefferson to
Meriwether Lewis, in which Jefferson gives Lewis
specific orders. She has also read several entries from
Lewis's diary
In his diary, Meriwether Lewis diligently records
details about the plants and animals the expedition
finds.
Reading Meriwether Lewis's diary confirms that he
carried out instructions issued by President
Jefferson.
In a letter to Meriwether Lewis, President Jefferson
issues instructions related to Lewis's travels.
Reading President Jefferson's letter to Meriwether
Lewis reveals that Jefferson had instructions for
Lewis.

c is the answer because first she would blush to make the reader wonder why which they find out in the next line.

  . 2 is the                                                                                                                                                      

the correct answer is option d. none of these. it is noted that options a, b, and c share the same content.

despite the valid answer provided at the last sentence of each of the options, a question/answer format shouldn't include humourous themed responses such as "you bet your thermal pj's we do." - unless of course, the answer is carried out in an informal environment. this could be replaced with a simple "yes" or "it is necessary".

the question should be re-phrased to a more appropiate syntaxis. instead of "do we need the greenhouse effect? ", it should be written as "is the greenhouse effect necessary? " in order to give it a general scope, instead of limiting the answer to the needs of "we" the humans.