ive tried to get help on this, but everupne ends up giving me the same answer i gave on my homework. the answer i gave in the girst picture is wrong. i tried all the atoms except for the three hydrogens connected to the c at the bottom, but it isn't correct. in the second picture is the hint that im given when i got the answer i gave and it turned out to be wrong. im just confused on what would happen to the molecule planerly if the single bond between the two double bonds can rotate freely.

Select only individual atoms, and not the bonds between them. Double bonds may be conjugated, meaning that there is one single bond between them. Identify all the atoms in the structure below that must lie in the same plane. Although it is possible for this molecule to adopt a conformation in which both double bonds and all their attached atoms are in the same plane, it is not necessary for this to be the case. The single bond between the two double bonds can rotate freely, allowing the two trigonal planar systems to be out of plane with respect to each other without disrupting the structure