Which of the following nations is the main source nation of algebra, trigonometry and calculus?

India is regarded as the main source nation of algebra, trigonometry and calculus.

Rome contributed to law and engineering but not to these branches of mathematics.

The USA is a modern nation and not the ancient origin of these fields.

China developed its own mathematics but is not credited as the source of these three.

Indian mathematicians made early advances that later travelled to the Arab world and Europe.

The Kerala school anticipated ideas of calculus centuries before Newton and Leibniz.