11c represents your share the partnership's profit or loss from trading section 1256 contracts. this number flows to form 6781 where it is split 60/40 long-term vs short-term and then the amounts flow to special lines on schedule D.
omitting income from your return is not good. the iRS gets a copy of the k-1 and could easily pick up the omission. whether it does something about it is a different matter.
that $28 does not really increase your audit risk
do not add it to schedule d directly. as stated 60% is long-term and 40% is short term so you would need two schedule d entries, and it still may cause audit issues because it's not properly reported on the 6781.
