💡 Detailed Explanation
The pattern '〜として' (toshitara) means 'as...', 'in the capacity of...', or 'as a...'. It establishes the qualification, role, status, viewpoint, or category under which someone acts or something is handled. It connects directly to nouns (e.g., 留学生として - as an international student). It is essential for defining roles. In this sentence, it translates perfectly as: "Because you are tired, please don't push yourself.". The correct option 'のだから' dynamically matches the structural requirements and logical flow of the statement. The other options do not satisfy the grammatical construction or fail to convey the appropriate semantic nuance.