Answer:
Environmental uncertainty or D) option is the factor that has contributed to the decline in the number of years used to define short-term and long-term plans
Step-by-step explanation:
The reason behind this is because constant changing has lead to different needs and different priorities for human beings. For instance, if the environment I polluted enough to stop using gasoline or diesel. There will be a huge change in the automobile and energy industries. Right now we are watching electric vehicles become popular because they are exclusive products. But once they are a necessity. The whole car industry will have to change electric engines for electric ones. So, the need the environment generates is leading the way. That is why environmental uncertainty is the correct answer.