Complete the sentence with a suitable question tag:
I’m old enough to take care of myself, ___
A) am I?
B) aren’t I?
C) do I?
D) will I?

Hint: A tag question is a composition that combines a declarative or imperative clause with an interrogative fragment. The resulting speech act consists of an assertion followed by a confirmation request. The English tag question "You're late, aren't you?" is an example.

Complete answer:
A sentence is turned into a question by using question tags. They're frequently used to double-check the information that we assume is correct. The question tag is usually negative if the main sentence is positive, and positive if the main clause is negative.

Now let us look at the given options:
A) am I?: This option is incorrect because "I'm" is a contraction of the subject and verb in the provided sentence (Am is the present tense form of the auxiliary verb: be). Because the supplied statement is positive, 'Am I' follows a negative sentence, which is incorrect.
B) aren’t I?: This is the correct option. The above clause is positive, therefore the question tag that will follow this sentence will be negative.
C) do I?: This option is incorrect because in the above sentence the verb is ‘am’ whereas ‘do I’ is used when the sentence has the verb ‘don’t’.
D) will I? : This option is incorrect because in the above sentence the verb is ‘am’ whereas ‘will I’ is used when the sentence has the verb ‘won’t’.

Thus, the correct answer is Option (B) i.e, aren’t I?

Note: Some rules of using question tags are:
- In question tags, always use pronouns.
- The tense of the statement and the question tag should be the same.
- Use the Contracted form of 'helpful verb' and 'not' for negative question tags. For example, didn't, hadn't, won't, and so on.