Each lobe contains
a. alveoli, which have lobules, where oxygen is transferred to the blood.
b. fissures, which have lobules, where oxygen is transferred to the blood.
c. lobules, which have alveoli, where oxygen is transferred to the blood.
d. lobules, which have fissures, where oxygen is transferred to the blood.

b. fissures, which have lobules, where oxygen is transferred to the blood.

Explanation:

The brain lobes are named after their location in relation to the skull bones. So we have five wolves: Frontal, Temporal, Parietal, Occipital, and the Insular Wolf, which is the only one unrelated to any skull bone, as it is situated deep in the lateral groove. The division of the cerebral lobes does not correspond much to a functional division, except for the occipital lobe that seems to be related only to vision.

However, all brain lobes have fissures, which have lobules, where oxygen is transferred to the blood.

frequency is the answer