Assertion (A) states that automation raises concerns about job displacement. This is generally true because as technology advances and tasks become automated, there is a concern that jobs traditionally performed by humans may be replaced by machines.
Reason (R) states that technological advancements are rapidly automating tasks previously done by humans. This statement is also true. Technological advancements have indeed led to the automation of many tasks that were once performed exclusively by humans. So, both Assertion (A) and Reason (R) are true. Reason (R) provides a plausible explanation for Assertion (A). The reason explains why automation raises concerns about job displacement - because technological advancements are leading to the automation of human tasks. Hence, (a) is the correct answer.