And adjective is a word used to describe a noun.
Baseball itself is a noun, so B is automatically false.
Yesterday is also a noun, so D is also false.
Now even though "good" is an adjective, don't be fooled! The question asks for an adjective that tells "how many?" This means that it's a word that tells the amount of something, so C is false.
The correct answer would be A, or ninth. It's an adjective that tells how many! :)
