The correct option is D Neo - Darwinism
Although Darwinism turned out to be the most widely accepted theory of evolution for a long period of time, it was observed that Mendelian genetic principles opposed evolution by natural selection. Microevolution (evolution at the genetic level such as mutations) and macroevolution (evolution at the level of a wide taxonomic group) could not complement each other. Thus, scientists working on different areas of life sciences came up with an explanation of evolution by merging Mendelian and Darwinian principles. This came to be known as the Modern Evolutionary Synthesis or Neo-Darwinism, as it explained the role of Mendelian genetics in natural selection. According to this theory, microevolution leads to macroevolution.