The most accurate response among the options provided is:
"because the actions that President Johnson took were justified by the Vesting and Take Care Clause of the Constitution."
This is because the Great Society initiatives, which aimed at eliminating poverty and racial injustice, were largely based on the belief that the federal government had the responsibility and authority (inherent powers) to act in the interest of the general welfare of the nation. The Vesting Clause grants the executive branch the power to execute laws, while the Take Care Clause mandates the President to ensure that the laws be faithfully executed, justifying a broad interpretation of federal powers in pursuit of social welfare initiatives.