Use the sentence to answer the question. Opals can be worth a lot of money. Which piece of evidence supports this inference? (1 point) a)One of Coober Pedy's most popular destinations, the mine provides visitors with an opportunity to learn about the search for opals and the struggles of Coober Pedy's earliest miners. b)In the heat of day, people are nowhere to be found, each hidden in an opal mine or dugout. c)Tourists sit on the hot, dusty earth, shooing away oddly persistent flies as they lose all sense of time searching for opals in the dirt, hoping that the next stone they turn might let them retire early. d)Coober Pedy is one of the least accessible towns in Australia—the place where the old American West meets Mars—which is probably why it gained a reputation as the place where outlaws went to hide.

c)Tourists sit on the hot, dusty earth, shooing away oddly persistent flies as they lose all sense of time searching for opals in the dirt, hoping that the next stone they turn might let them retire early.

Explanation:

Opal is a gel of high commercial value and beauty that is formed in rock cracks when temperatures are extremely low and the rocks are made of iron, magnesium, sandstone and basalt. The formation of this gel is very rare, which makes it very valuable and provides a lot of money for those who find it, as the question above says. An evidence that supports this statement is the existence of tourists who spend hours looking for opals, in the regions where it can be formed. These tourists do this so that, if they find an opal, they can sell it and have a lot of money for retirement.