Ralph Wants to Transfer an Instrument to Sigrid That Requires

Multiple Choice

Ralph wants to transfer an instrument to Sigrid that requires Ralph's indorsement, but there is no room on the instrument. Ralph

A) can attest in writing that he would sign the instrument if possible.
B) cannot transfer the instrument to Sigrid.
C) can sign an allonge and affix it to the instrument.
D) can sign a separate piece of paper and file it for later reference.