Read this introductory paragraph, which is missing an important element.
Elephants are often killed by poachers just for the ivory that comes from their tusks. It is creamy in color and easy to carve, making ivory valuable in many cultures. 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.
What is it missing?
A)A thesis statement
B)Background information
C)A hook
D)The tone is not set