Which of the following explains why emerging countries have difficulties creating sustainable agricultural practices?

emerging countries consume less food than more developed nations because they have smaller populations, so their current farming techniques suffice.
emerging countries farm naturally, so using pesticides, advanced irrigation techniques, and other modern farming practices are not necessary.
emerging countries do not have sustainable agricultural practices because they do not believe that sustainability is not worth the time or money.
emerging countries want to use sustainable agricultural practices, but they lack the funds, resources, and time to put them into practice.