The ovule of an angiosperm is technically equivalent to

The ovule of an angiosperm is technically equivalent to a megasporagium as it has megaspore mother cell that forms megaspores and one of the megaspores, in return, develops into an embryo sac or female gametophyte. It is larger than a microsporangium. 
(2) Ovule is not equivalent to megasporophyll as it is not a modified leaf.
(3) The ovule is not equivalent to the megaspore mother cell as it is multicellular and macroscopic and it has only one functional megaspore mother cell.
(4) The ovule is not equal to a megaspore as it is multicellular and diploid but not haploid.