The correct option is D Black marketing
Factors causing supply shortage are:
(a) Natural calamities
(b) Shortage of raw materials
(c) Smuggling, hoarding, and black marketing
(d) Increase in exports
An increase in exports causes a shortage of supply in the country. The goods that we have in our country are exported to other countries. Sometimes, this is done at the cost of not meeting the needs of the people inside the country due to an increased demand for Indian products in the international market.