Usage of HAVE BEEN - Kaplan

Hi,

I have some doubts on the usage of HAVE BEEN:

1. The recent amendments to the rules governing professional baseball, like those governing professional gymnastics, were motivated by a desire to make the sport more interesting to watch.
A)
B) those to the rules governing professional gymnastics, were motivated
C) those to the rules which govern professional gymnastics, were motivated
D) the amendments to the rules governing professional gymnastics, have been motivated
E) the amendments governing professional gymnastics, were being motivated

OA is B. When I googled this, I found that:
Here in D, HAVE BEEN indicates that the amendments are still happening. So, D is incorrect.

2. Scientists are currently trying to determine the extent to which tectonic plates have been shifted from their previous positions by earthquakes and other similar phenomena.

A. to which tectonic plates have been shifted
B. to which tectonic plates have shifted
C. of the shift of tectonic plates
D. of tectonic plate shifting
E. that tectonic plates have been shifted

OA is A.
I am confused why different answers for same usage and same passive strutures.

Please explain.

Source - Kaplan.