Read the passage, and choose the correct answer A, B, Cor D for each question.
World BBQ
To some people, there is nothing more appetizing than the smell of meat sizzling over an open fire. Throughout the world, people love to eat barbecue because it lets them together with friends and family to enjoy a meal that brings them back to their caveman roots. Cooking over coals or an open flame makes people feel more sociable.
Most countries have barbecue traditions, and they usually take place on national holidays. In the United States, it is a tradition to have a barbecue of hamburgers and hot dogs on July 4, which is Independence Day. In Taiwan, people get together to eat barbecue during the Moon Festival, and the smell of burning coal is in the air all day.
In South America, and in Argentina in particular, barbecue is a way of life. All sorts of meats andsausages are put on a large grill together over hot coals. Barbecue is even considered the national dish in Argentina, and it is given the name asado in Portuguese. This means not only the dish, but also the social event that surrounds an Argentinian barbecue.
When a person speaks about Turkish and Middle Eastern barbecue, the kebab immediately comes to mind. The tradition of taking different meats, and sometimes vegetables as well, and spearing them with a sharp stick called a skewer has crossed cultural lines today. Practically anywhere in the English-speaking world, the thought of shish-kebab will make barbecue lovers’ mouths water.
Wherever you go in the world, you are almost certain to come across a local method of preparing barbecue. If you visit different places, be bold and try whatever the local specialities are.

What does the phrase “brings them back to their caveman roots” in paragraph 1 mean?