An agate is not precious.
A) Some agates are not precious stones.
B) All agates are not precious stones.
C) No things identical to an agate are stones that are precious.
D) No agates are precious stones.
E) All non-precious stones are stones that are not agates.

Question

Quizplus · Accepted Answer

The statement "an agate is not precious" implies that there are no agates that are precious stones, thus the correct choice is D, "No agates are precious stones." Choices A and B are incorrect because they leave room for some agates to be precious, which is not supported by the statement. Choice C is incorrect because it suggests that agates are not stones, which is not stated in the statement. Choice E is also incorrect because it suggests that all non-precious stones are not agates, which is not supported by the statement.

An Agate Is Not Precious