When the value of the Rand decreases relative to other currencies, South African exports become cheaper for foreign buyers, leading to an increase in exports. At the same time, imports become more expensive for South Africans, which can lead to a decrease in imports.
This situation typically stimulates aggregate demand, as the increase in exports contributes to higher demand for goods and services produced in South Africa. Given this context, the most appropriate answer from your options would be:
increase in aggregate demand
This occurs because higher exports and lower imports both contribute to a net increase in demand for domestically produced goods and services.