Mecklenburg-Vorpommern has no state Foreign Minister.

The federation and state have different responsibilities.

A state government is not a smaller copy of the federal government with every same ministerial office. Responsibilities follow Germany’s federal structure. For this question, associate foreign relations primarily with the federation.

The other three answers name existing areas of state government responsibility. Ministries can combine several subjects, and their full names may change. This does not turn a European-affairs portfolio into a separate foreign ministry.

The other three answers

These three areas of responsibility exist at state level.

States can still take part in international affairs.

Article 32 requires consultation with a state before treaties affecting its particular circumstances. Within its legislative competence, a state may conclude treaties with foreign states with federal government consent. Primarily federal responsibility therefore does not exclude every international activity by states.

Under Article 47 of the state constitution, the Minister President represents the state externally. Treaties concerning legislative matters require the Landtag’s consent through a law. These rules allow state participation without changing Foreign Minister as the answer.