Which other nation showed interest in the Falkland Islands?

The United Provinces, which is associated with the history of Argentina, have shown a long-standing interest in the Falkland Islands. Historically, the Falkland Islands were claimed by Spain in the 18th century and were later occupied by the British. However, after Argentina gained independence from Spain, it inherited the Spanish claims to the islands. The United Provinces of the Rio de la Plata, which encompasses modern-day Argentina, argue that the Falkland Islands (referred to as "Las Malvinas" in Spanish) are part of their territory based on this historical claim.

Throughout the years, Argentina has maintained a strong national sentiment regarding the sovereignty of the Falkland Islands, leading to the notable conflict with the United Kingdom in 1982. This historical context highlights the significant national interest Argentina, represented by the United Provinces, has in the region, making it the correct answer to the question regarding which nation showed interest in the Falkland Islands.

The other nations mentioned have had various interactions with the islands but did not assert the same sovereignty claims or historical interest as Argentina.