Explanation:

- In India, high courts are the principal civil courts of original jurisdiction in each state and union territory, although a high court exercises its original civil and criminal jurisdiction only if the subordinate courts are not competent to try such matters.

- As of January 2019, there are 25 high courts in India. This includes newer high courts that have been established over the years to cater to increased administrative need.

- Option 1 (18) is incorrect because the number has surpassed that count long ago with the addition of new states and the bifurcation of existing ones.

- Option 2 (30) is incorrect as the number was still less than 30 during that time.

- Option 4 (20) is also incorrect, as the number had already increased beyond this by January 2019.