In Certain Studies with Rats,female Scientists Get Consistently Different Results

Multiple Choice

In certain studies with rats,female scientists get consistently different results from those of male scientists.Why?​

A) Female scientists tend to talk more than male scientists do.
B) ​On average, female scientists tend to be more afraid of the rats.
C) ​On average, male scientists handle the rats more roughly.
D) ​Rats produce a stress response to the smell of male scientists.