To solve this analogy problem, we need to understand the relationship between the words "caw" and "crows." "Caw" is the sound made by crows. Similarly, we are looking for the sound associated with "cows." Examining the options:
bleat: The sound made by sheep, so this is incorrect for cows.
snort: A sound associated more with horses or pigs, not cows.
low: Although this can mean a soft sound made by cows, it's less commonly used than "bellow" in this context.
bellow: This is the correct word for a loud sound made by cows.
Therefore, the correct answer is bellow, making the analogy "Caw is to crows as bellow is to cows."