(D) Liberalisation
Removing barriers or restrictions on foreign trade and foreign investment set by the government is known as liberalisation.
Source: Chapter 4, Liberalisation of foreign trade and foreign investment policy
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The passage explicitly states: "Removing barriers or restrictions set by the government is what is known as liberalisation." Examiners expect you to identify the correct term and may award the mark only for option (D). Writing the definition is optional but shows clarity.