Concept:
India exports horticultural produce such as mango and banana to several countries. Gulf countries are important destinations for Indian fruits.
Step 1: Identify the importing region.
Among the given options, UAE is a major importer of Indian mango and banana.
\[
\text{Indian mango and banana exports} \rightarrow \text{UAE}
\]
Step 2: Compare with other options.
USA imports mango from India but is not the best answer for both banana and mango in this option set.
USSR is an old geopolitical term.
South Africa is not the major importer among the given options.
Step 3: Final answer.
Therefore, the major importer is UAE.
\[
\therefore \text{Correct Answer is (C)}
\]