A same meaning or not problem:
In October 2001 , he defended his Ph.D. in Psychology at the Free University of Brussels on the theme of the human models of cognitive hypertext navigation .
In October 2001 , he defended his PhD in Psychology at the Free University of Brussels on the subject of cognitive models of human hypertext navigation .
****
[A]: no

A same meaning or not problem:
Ramakrishna is a family drama in Tamil directed by Agathyan produced by Sivasakthi Pandian .
Ramakrishna is a family drama in Tamil staged by Agathyan , directed by Sivasakthi Pandian .
****
[A]: no

A same meaning or not problem:
Pixar also visited the Disney Cruise Line and studied Las Vegas , which was helpful for understanding artificial lighting .
Pixar also studied the Disney Cruise Line and visited Las Vegas , which was helpful in understanding artificial lighting .
****
[A]: no

A same meaning or not problem:
This theory does not explain the observed instability of colloidal dispersions against irreversible aggregation in solutions of high ionic strength .
This theory did not explain the observed instability of irreversible dispersions against colloidal aggregation in solutions with high ionic strength .
****
[A]:
no