Answer:
A. net exports
Explanation:
Net exports are volatile in nature, as related to an economy the consumption and income can be estimated fairly, depending up on the needs and requirement in an economy.
But when it come to net exports, it does not individually depend upon income or status of demand in own country but also up on the spending capacity of another economy, the demand of purchasing country.
It basically relates to the country's efficiency to supply and the opposite country's demand.
Thus, it is volatile in nature.