The plain of jars in north east laos, is one of the oldest archeological mysteries in southeast asia. Located on the plateau of xieng khouang, in the mountains

The plain of jars in north east laos, is one of the oldest archeological mysteries in southeast asia.
Located on the plateau of xieng khouang, in the mountains of indochina, there are about 90 different jars sites. Eacha site contains from 1 to 400 jars. It has been estimated that they were created 3,000 years ago, and are made of sandstone, limestone, granite, breccias and conglomerate, with the majority being made of sandstone. The tallest jar is about 9 feet tall and all are made from their own individual slab of stone.
At first glance the jars appear to be haphazardly placed, with some standing upright and others on their sides, pointing in different directions. Further studies have revealed that they are placed in positions that form the constellation patterns of the stars. There has been lots of specukation about the purpose of the jars -drinking glasses for a giant race, being used to collect rainwater, or as burial urns.
Mors of the jars are empty, but a few have been found with bodies or tools inside, or filled with miniature Buddha statues. Exploration is hard as the area is littered with unixploded bombs from the secret war.

1. Why does the writer write the text?
A. To discover the
mystery of the plain of jars.
B. To tell the readers about a sacred place in laos.
C. To share i formation about a specific historical place.
D. To express his/her amazement towards the plain of jars.

2. Who will be more interested to read articles about the jars?
A. geologist
B. historians
C. sociologist
D. archaeologists

3. "further studies have revealed that (they) are placed in positions... " (paragraph 3)
The underlined word refers to
A. the jars
B. the stars
C. the studies
D. the constellation forms