Question

in paragraph 1 of the passage, what is the meaning of the word luster?
worth
shine
covering
strength
reading passage
elephants and ivory
1 creamy in color and perfect for carving, ivory has long been sought after for art, for practical uses, and simply for its beauty. once considered as valuable as gold, ivory has several properties that have created and sustained its worth. it does not easily burn; it is generally unharmed by water, it polishes to a beautiful luster, and it is extremely durable. these were considerable virtues in the days before plastics. since then, ivorys beauty and peerless qualities have continued to make it intensely desirable. unfortunately, the beauty of ivory comes at a terrible cost.
sources of ivory
2 although ivory comes from walruses, narwhals, and a few other animals, when most people talk about ivory, they are referring to elephant ivory. of the two types of elephants, the african elephant and the asian elephant, the ivory that we are most

Explanation:

The word "luster" in the context of "it polishes to a beautiful luster" is related to a shiny appearance. "Shine" is the most appropriate synonym as it directly refers to a bright, reflective quality. "Worth" refers to value, "covering" to something that covers, and "strength" to power or force, none of which fit the context of polishing to a certain quality as well as "shine".

Answer:

shine