Premise & hypothesis: Is the premise "A Nigerian vendor displays his collection of sunglasses for sale." true if "A vendor displays his glasses downtown."?
A: it is not possible to tell

Premise & hypothesis: Is the premise "Several kinds and adults sit on a porch at night" true if "The people on the porch are engaged in a meaningless banter."?
A: it is not possible to tell

Premise & hypothesis: Is the premise "Two females, one wearing a yellow dress, the other wearing a white top and black shorts posing for a picture." true if "Two women pose for a picture"?
A: yes

Premise & hypothesis: Is the premise "A group of bicyclists riding down a path in an off road race." true if "Bikers ride down a path in a national race"?
A:
it is not possible to tell