The correct answer is D. both (a) and (c).
Computers have traditionally done better than people at storing information and computing numerically. Computers can store vast amounts of information in a very small space, and they can access that information very quickly. Computers can also perform complex mathematical calculations very quickly.
People, on the other hand, are better at responding flexibly to new situations. People can think creatively and come up with new solutions to problems. People are also better at understanding and responding to human emotions.
However, computers are becoming increasingly good at tasks that were once thought to be exclusively human, such as understanding and responding to natural language. As computers continue to evolve, it is likely that they will become even better at storing information, computing numerically, and responding flexibly.