Final answer:
President Lyndon B. Johnson signed the Voting Rights Act into law on August 6, 1965, marking a crucial step in civil rights history.
Step-by-step explanation:
The Voting Rights Act was signed into law by President Lyndon B. Johnson on August 6, 1965. This significant civil rights legislation aimed to overcome legal barriers at the state and local levels that prevented African Americans from exercising their right to vote as guaranteed under the 15th Amendment. The act is considered one of the most pivotal pieces of civil rights legislation in American history. President Johnson gave a historic speech during the signing ceremony that was attended by important civil rights leaders such as Martin Luther King Jr. and Rosa Parks.
To directly answer the student's question, the correct response is: (a) Lyndon Johnson signed the Voting Rights Act, which is one of the key civil rights laws along with the Civil Rights Act of 1964.