Answer:
A. exclave
Step-by-step explanation:
Enclaves are regions (independent or not) that are within another nation, having no border with another country, being surrounded or "encluded" within the territory of others. An example of an enclave is Lesotho, wedged within South African territory.
An enclave may also have an exit to the sea, but it must be restricted to a single country border. An example is Brunei Darussalam, an independent country located on the island of Borneo, considered an enclave as it has only a small outlet to the ocean, bordering Malaysia only.