The most populous spanish speaking country is Mexico.
In order to decrease Karst topography, we should add less carbon dioxide to the atmosphere since that causes the rainwater to become acidic.
<h3>Why should we reduce carbon dioxide emissions?</h3>
Carbon dioxide in small quantities cannot cause too much acid rain but with the increase in its emissions, a situation has formed where acid rain instances have risen.
This leads to the acid rain dissolving limestone which causes Karst topography. Reducing carbon dioxide would therefore decrease this phenomenon.
In conclusion, option A is correct.
Find out more on Karst topography at brainly.com/question/2794887.
