The correct answer to this open question is the following.
Although you did not include the options of the question, we can answer the following.
The metaethical theory that holds that morality is subjective and grounded in attitudes is the theory of Metaethical Relativism. In this branch of philosophy and ethics, philosophers focus on moral judgment as a matter of study. Specifically, Metaethical Relativism focuses on the behavior and conduct of humans, taking into consideration the fact that people express moral judgments from their own personal background or trying to fit into the standards of society. From social conventionalism and self-belief systems, people stereotype and express moral and ethical judgments.
I believe it is false. Hope it helps!
