Final answer:
The statement is false, as the main antagonist in the Sea of Solitude is not marital discord, but rather the protagonist's inner struggles and mental health issues.
Step-by-step explanation:
The statement that the main antagonist in the Sea of Solitude is marital discord is False.
Marital discord refers to conflicts or tension within a marriage. It is not the main antagonist of the Sea of Solitude. The main antagonist in the Sea of Solitude is the protagonist's inner struggles and mental health issues as she navigates a world submerged in water.
Therefore, the correct answer is False.