This cranial meninges is in close proximity of the brain tissue

The correct option is: the ventral portion of the midbrain is composed of mainly four, round swellings known as corpora quadrigemina

Let us analyze the structure of the midbrain to understand why this option is correct in the context of identifying the incorrect statement among the options provided (or explaining the provided answer).
In human anatomy, the midbrain (mesencephalon) is located between the thalamus/hypothalamus of the forebrain and the pons of the hindbrain. A canal called the cerebral aqueduct passes through the midbrain. The dorsal (posterior) portion of the midbrain consists mainly of four round swellings (lobes) called corpora quadrigemina. Therefore, stating that the ventral portion of the midbrain is composed of these four round swellings is anatomically incorrect; they are actually located on the dorsal side.