The question is asking about the specific date on which an advertisement appeared in the Times of India.

Option 1 suggests the year 1931, option 2 suggests 1929, and option 3 suggests 1921. These are all possible years in the 20th century when the advertisement could have been published.

Option 4, however, proposes the year 1896, which is in the 19th century. The correct answer is indicated to be option 4, 1896.

It`s possible that the answer is 1896 as the Times of India was in publication during this time, having first been established in 1838. The specific details for this correct answer would depend on the content of the advertisement mentioned. The other dates mentioned may be incorrect because the advertisement in question may not have been published in those years, hence why 1896 is the correct answer.

Without additional context or details about the advertisement itself, a more specific explanation would be impossible to give.