An instrument that has no room for endorsements : Can have a separate piece of paper firmly attached to it with an endorsement (Allonge)
Option C
Explanation:
An allonge is a piece of paper attached to an exchange bill or promissory note on which the instrument itself can not be approved.
An allonge is a paper slip issued as a bill of trade to a negotiable device in order to receive additional permits for which there may be inadequate room on the bill itself. A description of the length of time is assumed to be written on the bill itself.
If the instrument doesn't have space, a note can be written on a different (called an allonge) piece of paper that is securely attached. The instrument requires a paper firmly attached to a negotiable instrument.