Fill in the blank with the most appropriate word. That machine is automatic. It runs by ________ .
The correct option is A itself When the subject and the object of the verb is the same person or thing, we use a reflexive pronoun. When reflexive pronouns are used to put emphasis on a particular noun, they are called emphatic pronouns.
In the given sentence the subject and the object of the verb is 'the machine'. So a reflexive pronoun must be used.
'It' is not a reflexive pronoun. It is a personal pronoun. Thus we can eliminate option B as incorrect.
The reflexive pronoun for singular third person is 'himself','herself' or 'itself' according to the gender of the noun.
In the given sentence the noun is a building. So, the reflexive pronoun used must be 'itself'.
Thus option A is the correct answer. Option D is incorrect.
'Themselves' is the reflexive pronoun for third person plural. Thus option C is incorrect