The most important savings surplus unit in an economy is the savings for individuals.
As saving is in relation to investment, it is important to the economic progress of a country. Up to a point, a higher saving rate will generally lead to higher levels of economic output in the long term.
In an economy, a savings surplus unit is an economic unit with income that is greater than or equal to expenditures on consumption throughout a period. For instance, surplus units are referred as economic units whose income exceeds spending on goods and services.
Thus, in an economy, savings for individuals is the most important savings surplus unit.
Hence, option A is correct.
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