Which of the following sentences uses an Article INCORRECTLY?

The correct answer is Option (2) → What is a time of your arrival?

Definite article "the":

• "The" is used before a noun that is particular, made definite by the words that follow it.
• This sentence: "time" is made particular by "of your arrival"; there is only one such time, so "a" must be "the".
  Corrected: What is the time of your arrival?
  Example: The date of the exam has been announced.

Why the Other Options are Incorrect?

Option 1: They cannot be trusted even a bit. — Incorrect. Correct use: "a bit" is a fixed phrase meaning a little; "a" is correct here.

Option 3: He is a strange person. — Incorrect. Correct use: "a" is used before a singular countable noun mentioned in general, beginning with a consonant sound.

Option 4: There are no friends in the room. — Incorrect. Correct use: the plural "friends" after "no" needs no article, and "the room" is a particular room; both uses are correct.