Fill in the blanks with the correct alternative.
Caw is to crows as ............... is to cows.
This is a straightforward analogy of animal to characteristic sound: caw is the word used specifically for a crow's call, so we need the word used specifically for a cow's call.
Between "low" and "bellow", "low" is the word specifically and traditionally paired with cows (as in the phrase "the lowing herd"), while "bellow" belongs more to bulls and larger, louder animals. Since the question wants a word matched to "cows" the same exact way "caw" is matched to "crows", "low" is the better fit.
Let's summarize:
The word that completes the analogy is "low", option C.