Which one of the following is the correct matching of three items and their grouping category?

Each half of the pelvic girdle is a coxal bone, formed by the fusion of three bones: ilium, ischium and pubis. This matching is correct.
The pyrimidines are cytosine, uracil and thymine; thiamine is vitamin $B_1$, not a nitrogenous base.
The ear ossicles are malleus, incus and stapes; the cochlea is the coiled part of the internal ear.
Actin and myosin are muscle proteins, but rhodopsin is the visual pigment of the rod cells of the retina.
Hence the correct matching is ilium, ischium, pubis – coxal bones of the pelvic girdle.