In Its 2012 Decision of the Independent Business Et Al

In its 2012 decision of the Independent Business et al.v.Sebelius, Secretary of Health and Human Services case, the Supreme Court upheld Obamacare on the basis that the law

A) involved taxation by the government.
B) involved regulation of interstate commerce.
C) conformed with the freedom to assemble and receive health care.
D) fell under the purview of Congress's right to pass legislation.
E) was constitutional based on the Fourteenth Amendment's equal protection clause.