Why why is chemical weathering most effective in the most in the equatorial region

Chemical weathering is most effective when water is present. Therefore, the amount of chemical weathering in an area is controlled largely by the amount of available water. The weathering process disaggregates rock, but it does not remove rock material from its original location.

Explanation:

developed and developing countriescountries are divided into two major categories by the united nations, which are developed countries and developing countries. the classification of countries is based on the economic status such as gdp, gnp, per capita income, industrialization, the standard of living, etc. developed countries refers to the soverign state, whose economy has highly progressed and possesses great technological infrastructure, as compared to other nations.

a is the answer i believe.