Complete the sentence with the correct word from the given options.
Then he had _______ shower.
a) a
b) an
c) the
d) his

Hint: An article is (grammar) a determiner that may indicate the specificity of reference of a noun phrase.

Complete answer:
In the given question, we have to find out which of the options includes an indefinite article for a word starting with a consonant sound (shower) as the noun shower is a nonspecific reference.
Let us thus analyze the options given to us in this question-
Option (a.), 'a', refers to the indefinite article used for words starting with consonant sounds.
Therefore, option (a.) is correct.
Option (b.), ‘an', refers to the indefinite article used for words starting with vowel sounds
Therefore, option (b.) is incorrect as we need the indefinite article used for words starting with consonant sounds.
Option (c.), ‘the', refers to the definite article used for specific references. Therefore, option (c.) is incorrect as we need the indefinite article used for words starting with consonant sounds.
Option (d.), ‘his', refers to a possessive personal pronoun. Therefore, option (d.) is incorrect as we need the indefinite article used for words starting with consonant sounds.

Note:
In this question, it will be helpful for the student to recall the concept of a definite and indefinite article. A definite article is a determiner (as `the' in English) that indicates the specificity of reference. An indefinite article is a determiner (as `a' or `some' in English) that indicates nonspecific reference.