Question

based on the context of the passage, which of the following words would best replace the underlined word?\
\
\bigcirc a. event\
\bigcirc b. burden\
\bigcirc c. insight\
\bigcirc d. race\
\
(the passage text is about the construction of the transcontinental railroad, including the workers involved, the competition between the two companies, and the final connection of the rails.)

Explanation:

The passage describes the Nevada mountains as a "great obstacle" that slowed railroad construction. We need a synonym for "obstacle" from the options. "Hurdle" means a barrier or obstacle that must be overcome, which matches the context. "Event" refers to an occurrence, "height" refers to elevation, and "race" refers to a competition, none of which fit the meaning of obstacle here.

Answer:

B. hurdle