The two examples which correctly punctuate an essential expression or element in the sentence are:
Architecture, so popular with Native Americans, is still a flourishing art.
Mexico, where sports are popular, has hosted the Olympic Games at the World Cup.
Some constituents that alter a sentence are indispensable and restrict the meaning of an altered word or prhase, whereas others aren't indispensable and don't affect its meaning. The first ones are separated from the main idea using commas.
Mexico City is home to several museums that display the country’s past. Here we don't have any non essential element.
The National Historical Museum, which is in Chapultepec Castle, is concerned with Mexico’s history since the Spanish conquest. Here, information can't be ommited and in fact, shouldn't be set off with comas, since such expression contains essential information (it is not any National Historic Museum but the National Historic Museum which is in Chapultepec Castle).
The correct answer should be choice A .... not sure
The answer is the struggle between realistic and supernatural elements
Answer:
"Now, if I kill him here, Nagalna will know, and if I fight him on the open floor, the odds are in his favor. What am I to do?" said Rikki-tikki-tavi.
Nag waved to and fro, and then Rikki-tikki heard him drinking from the biggest water-jar that was used to fill the bath. "That is good," said the
snake. "Now, when Karalt was killed, the big man had a stick. He may have that stick still, but when he comes in to bathe in the morning he will
not have a stick.
Explanation: