She has visited her grandparents, ___? Select one:
a. hasn't she
b. has she
c. doesn't she
d. does she

a. hasn't she

Explanation:

Present perfect with negative tags

Tag questions (or question tags) turn a statement into a question. They are often used for checking information that we think we know is true.

Tag questions are made using an auxiliary verb (for example: be or have) and a subject pronoun (for example: I, you, she). Negative question tags are usually contracted: It's warm today, isn't it (not 'is it not')

Usually if the main clause is positive, the question tag is negative, and if the main clause is negative, it's positive. For example: It's cold (positive), isn't it (negative)? And: It isn't cold (negative), is it (positive)?

If the main clause has an auxiliary verb in it, you use the same verb in the tag question. If there is no auxiliary verb (in the present simple and past simple) use do / does / did (just like when you make a normal question).

There is one weird exception: the question tag after I am is aren't I.

For example: I'm in charge of the food, aren't I?

in this passage from chapter 6 of "animal farm", by george orwell, what the author is ridiculing in this passage is the frivolity of some rules.

clover, the mare, believes she remembers that the fourth commandment forbade sleeping in beds because it was something that humans did. snowball, napoleon, and the pigs are brain-workers who look after the welfare of the farm. they are the obvious leaders because they are smart, and so they are entitled to eat the best food and sleep in beds. it is squealer, who says these lines making the difference between sleeping with sheets, what humans do, and sleeping in beds, what pigs do. the unwillingness to question authority makes the oppressed to obey without thinking.