Which best describes a country with a cash crop economy?

a country that has plenty of money to invest in infrastructure
a country that has plenty of money to buy factory goods
a country whose economy depends on the success of just one crop
a country whose people use currency to buy food

The correrct option is "a country whose economy depends on the success of just one crop"

The monoculture refers to large-scale plantations with the cultivation of a single species, with the same patterns, resulting in a genetic similarity, using the same methods of cultivation for the entire plantation (pest control, fertilization and high standardization of the production), which makes large-scale production more efficient. Frequent cases of monoculture occur with eucalyptus, pine, in the case of trees, or large plantations of cereal, soybean, sugar cane, cotton, corn, which produces soil degradation because they only absorb the nutrients they consider necessary for its growth, doing so, that the soil loses its fertility by ending one (or more) of its nutrients.

someone or something lol