Question

Copper is
useful metal
Select one:
a. the
b. no article
c. an
d. a​

Answer 1

Answer:

d. a

Explanation:

Copper is a useful metal.

An/A' is used as an indefinite article for a thing or person when the reader doesn't know which one we are referring to out of many nouns. It states the random nature of the subject.

'The' is used as a definite article for a thing or person when the reader knows which one we are exactly referring to. It states the specific nature of the subject.

Option A is incorrect  as 'An' is used as an indefinite article with a word having a vowel sound, although in this sentence  'Useful' begins with 'U' ,a vowel  but it has a consonant sound.  Option B is incorrect as 'The ' is used for a particular noun out of many nouns.  Option C is incorrect  grammatically. incorrect . In Option D  'a' is used as the indefinite article with a singular countable noun and is grammatically correct.

Answer 2

Answer:

d.. A ........... is your answer.