"City of Gold" focuses on the European explorers and how the ___ of El Dorado led them to search unsuccessfully for the city. On the other hand, "El Dorado's Gold" focuses on the tribe whose got Europeans thinking the city was real.

may i know the title of the book?

b would have to be the answer

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.