Final answer:
The telencephalon is the embryological brain vesicle that will form the cerebrum. The correct option is 3) the telencephalon
Step-by-step explanation:
The embryological brain vesicle that will form the cerebrum is the telencephalon. This is one of the five secondary vesicles that develop from the primary vesicles of the embryonic brain.
The telencephalon arises from the division of the prosencephalon, or forebrain, which is the forward-most vesicle of the embryonic brain.
The diencephalon, another secondary vesicle from the prosencephalon, will give rise to several adult structures, but not the cerebrum.
The rhombencephalon, another primary vesicle, subdivides into the metencephalon and myelencephalon, but these structures are associated with the cerebellum, pons, and medulla oblongata, and are collectively considered part of the brain stem rather than contributing to the formation of the cerebrum.
Hence, the cerebrum does not develop from the myelencephalon, metencephalon, or mesencephalon. The correct option is 3) the telencephalon