Answer:
Option B, wax
Step-by-step explanation:
Cerumin/o- is the root phrase denoting cerumen, which is colloquially known as earwax or, simply, wax. An example of this phrase at work can be seen in the phrase "ceruminous glands," the specialized apocrine glands of the external canal of the ear responsible for secreting the waxy substance.
Common combining forms for bone are oste/o- and ossicul/o-.
Cardi/o- is the common root phrase for heart. There are also root phrases to refer to locations on the heart themselves such as ventricul/o- for the ventricles; sept/o- for the septum separating the chambers; aort/o- for the great vessel known as the aorta; and atri/o- for the atria.
Hem/o- is the common combining form of blood.
But the main focus here is cerumin/o- meaning wax, option B.