Identify the sentence with the incorrect article:-

(A) Shut the box.
(B) He promised to use the medicine I gave him.
(C) The rich are not always happy.
(D) All a world knows this.

Choose the correct answer from the options given below:

(D) Only

The correct answer is Option (1) - (D) ( All a world knows this.)

Incorrect. The article "a" is incorrect here because it implies an unspecified or singular world, which doesn't make sense. The correct phrasing should be "All the world knows this," referring to the entire world.