Well into the 1860s the American West remained
divided from the East by the harsh nature of the
country’s interior. ----.Their aim was to build a
railroad across the formidable mountainous
lands of the Sierra Nevada. They were ridiculed
on all sides, but the ambitious enterprise
eventually succeeded.
A) Their high-flying goal comes with similarly steep
challenges
B) Top engineers had agreed that the Sierra
Nevada could not be crossed by road or rail
C) Naturally, politicians were not in favour of uniting
East and West
D) Then four merchants began raising money to
fund a seemingly impossible project
E) The high peaks of the Sierra Nevada were
acknowledged as being impassable

Bu soruda boşluktan sonra gelen kısım bize boşluğa gelecek cümleyi tarif ediyor.
ilk etapta AveE şıkları gidiyor.
hedef olumlu olduğu için
olumsuz olan BveC şıklraıda gidiyor.
Geriye D şıkkı kalıyor.