Respuesta :
Proper noun, Neither, Neither, Common.
Jeff is a proper noun because a Proper noun is something that begins with a capitol, and is commonly known for a individual person, place, or organization.
was is neither, because it doesn't describe a person, place, or thing, (or organization), and doesn't start with a capitol (for Proper)
same with in
store is a common noun because, it is in fact a place.