Very ideally, and very strictly speaking, the falling leaves in autumn make the world spin a bit ____________________. A) All of these.B) faster.C) slower.D) off center and erratic.E) smoother.

To answer this question, we need to understand the scientific concepts behind it. The falling leaves in autumn do not directly affect the rotation of the Earth. The Earth's rotation is determined by complex factors such as gravitational forces, distribution of mass, and conservation of angular momentum.

The falling leaves, which are relatively light and dispersed in comparison to the Earth's mass, do not have a noticeable impact on the planet's rotation. Therefore, option A) "All of these" is not correct, as none of the options provided accurately describe the effect of falling leaves on the Earth's rotation.

In summary, the falling leaves in autumn do not make the world spin a bit faster, slower, off center and erratic or smoother. The correct answer is option E) None of these.