Choice "B" is correct. The words "for deposit only" restrict further negotiation of the instrument and so are an example of a restrictive endorsement.
Choice "d" is incorrect. A blank endorsement does not name a special endorsee. The words "for deposit only" create a restrictive endorsement, not a blank endorsement.
Choice "c" is incorrect. A qualified endorsement is one that includes the words "without recourse" and so eliminates the endorser's contract liability on the instrument.
Choice "a" is incorrect. A special endorsement is one that names a new payee.