In the following question a sentence is given with a blank followed by 5 options. From the given options choose the option which can fill the given blank most appropriately and make the sentence both contextually and grammatically correct. The new law requires citizens to ________ their income details when filing their tax returns.

The correct word is "disclose". It means to reveal or make something known, especially information. In the context of the sentence, citizens are required to reveal or provide their income details when filing tax returns. Illustrate means to explain or clarify something with examples, which doesn't fit here. Disseminate means to spread or distribute information, but it doesn't align with the action of revealing income details. Distort means to change something in a misleading way, which is the opposite of what the law is requiring. Ignore means to pay no attention to something, which doesn't make sense in the context of the sentence.