The correct answer is that computer processing power will double every 18 months to two years. Gordon Moore, who later co-founded Intel, made this observation in a 1965 paper, noting that the number of transistors that could be fitted on an integrated circuit was roughly doubling at a regular pace. This became known as Moore's Law, and it is popularly summarised as computing power doubling every one and a half to two years while cost stays roughly the same.
Moore's Law has been remarkably accurate for decades, driving the rapid growth of computing capability, smaller and cheaper chips, and faster devices, and it became a guiding benchmark for the semiconductor industry's research and manufacturing targets.
Option 1 is wrong since the law is about growth in capability, not chips becoming obsolete. Option 3 is wrong since transistors remain the fundamental building block of chips, the law is about how many can be packed in, not about eliminating them. Option 4 is wrong because it states power getting reduced by half, which is the exact opposite of what Moore's Law actually predicts.