Final answer:
The Supreme Court's decision in Boynton v. Virginia affirmed the right to interstate travel free from racial discrimination, paving the way for the Civil Rights Act of 1964. Hence, the correct answer is option C.
Step-by-step explanation:
The Supreme Court's decision in Boynton v. Virginia paved the way for the Civil Rights Act of 1964 by affirming the right to interstate travel free from racial discrimination. In Boynton v. Virginia, the Supreme Court ruled that racial segregation on interstate buses was unconstitutional, leading to the desegregation of interstate travel. This ruling set a precedent that racial discrimination in public accommodations, including transportation, was illegal. The Civil Rights Act of 1964 expanded on this precedent and prohibited discrimination in all public places, including hotels, restaurants, and other establishments.