It would be all of those, or in other words, D.
Books and printed info is an obvious one for a library.
Libraries also have computers that you can use, so you can have access to electronic sources for sure.
Staff members are always there to help.
I need help!
What can your public library provide you with?
books and other printed information about careers
access to Internet sites and other electronic materials about careers
staff members to help you find materials
all of these
2 answers
The process of elimination is very useful when you are in doubt.