In matthias mehl and james pennebaker's (2003) research with university of texas students, they found that almost ­­­­­­ percent of the students' time was spent in conversation.

The correct answer is: In Matthias Mehl and James Pennebaker's (2003) research with University of Texas' students, they found that almost 30 percent of the students' time was spent in conversation.

The study tracked the social enviorment and conversations of students of University of Texas for 2 day periods with a break of 4 weeks.

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.

i am pretty sure it is d.