This is quite . . . . . . . . good poem. A. a B. an C. the D. no article

The correct answer is: D. no article

The reason is that the word “poem” is a non-count noun. Non-count nouns do not have a plural form and they are not preceded by an article.

Some other examples of non-count nouns are:

• water
• air
• love
• happiness
• information
• advice

When we use a non-count noun, we can use it with a quantifier, such as:

• some water
• a lot of water
• a little water
• much water
• all the water

We can also use it with a possessive adjective, such as:

• my water
• your water
• his water
• her water
• our water
• their water

Finally, we can use it with a demonstrative pronoun, such as:

• this water
• that water
• these waters
• those waters

I hope this helps!