Final answer:
The rights of the accused were expanded significantly in the Supreme Court rulings of the 1960s and 1970s. Option B.
Step-by-step explanation:
The statement that summarises the Supreme Court rulings in the 1960s and 1970s is B) The rights of the accused were expanded significantly.
During this time period, the Supreme Court made several landmark decisions that expanded the rights of individuals involved in the criminal justice system. For example, in Miranda v. Arizona, the Court ruled that all suspects must be read their rights before being questioned by authorities. The Court also established the right to legal counsel and set guidelines for the exclusion of illegally obtained evidence in Mapp v. Ohio.
These rulings had a significant impact on protecting the rights of individuals and ensuring a fair judicial process.