What type of investment should I select in the Sales info (boxes 1a-1d) for a Certificate of Deposit sold for no gain but was reported on a 1099-B? CTF DEP isn't an opt.

I would suggest stock, mutual fund, bond, or other.  It does not really matter the type since it is not employee stock or other such similar item.  The main concern for normal transactions such as this is the proceeds received and the cost basis of the financial instrument.