Multi-select problem: How does the next paragraph end?

Several clips are shown of people climbing up and down rock walls while many others speak to the camera. several more people

Possible answers:
(a). are seen speaking to the camera as well as walking into a building and meeting up with others..
(b). are shown climbing on the rocks while speaking to the camera and making their way up and down..
(c). are seen speaking to the camera of supplies and performing stunts while a man films them from several angles..
(d). are seen climbing along the wall as well as standing at the top and speaking to the camera..
(b).