The time taken by the sun to revolve around the centre of our galaxy is

Astronomical measurements place the Sun’s orbital period around the Milky Way — the “galactic year” — at a few hundred million years. A standard textbook estimate gives about 220 million years for one revolution of the Sun around the Galactic Centre [1]. Independent educational sources and astronomy texts typically quote a similar value in the 225–250 million year range, often rounded to 250 million years for convenience [2]. Among the provided options (25, 100, 250, 500 million years), 250 million years is the closest standard rounded estimate to measured values and is therefore the best choice.

Sources

1. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 1: The Universe, The Big Bang Theory, Galaxies & Stellar Evolution > Our Galaxy (The Milky Way) > p. 9
2. [2] https://openstax.org/books/astronomy-2e/pages/25-3-the-mass-of-the-galaxy