Which of these pairs shows the correct combination of bones and types of joints present in them?
a) elbow - hinge joint
b) elbow - ball and socket joint
c) elbow _ pivot joint

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 Elbow - hinge joint is the pairs shows the correct combination of bones and types of joints present in them. 

In primates, including humans, the elbow joint is the synovialhinge joint between the humerus in the upper arm and the radius and ulna in the forearm which allows the hand to be moved towards and away from the body.

Volunteer bias

Explanation:

In the given situation the chances of participation of males in the study of sexuality is likely to more than the females or may be male volunteer may be available more readily. As the females are more inexpressive or may feel shy when asked for their own opinion related to topic of sexuality.

But males may be more comfortable while discussing topic related to sexuality . Thus this will create volunteer bias in the subjects of study.