What characteristics are typical of a Jack Russell Terrier?

The characteristics typical of a Jack Russell Terrier include being sturdy, fearless, and lively, making option B the correct choice.

Jack Russell Terriers are known for their strong and compact build, which gives them a sturdy appearance. This breed is also recognized for its fearless attitude, often showing confidence and determination in various situations, including hunting and agility activities. Their lively nature is one of their most distinct traits; they are energetic and need regular exercise to maintain their health and happiness. This high energy level demands an active lifestyle, as they enjoy engaging in physical activities and playtime.

In comparison, other options present traits that do not align with the Jack Russell Terrier's typical behavior or personality. For instance, adjectives like gentle and lazy do not reflect the energetic and spirited disposition of this breed. Furthermore, being docile, quiet, and reserved is contrary to the Jack Russell's tendency to be alert and active, while loyal, timid, and slow is not indicative of the breed's fearless and vivacious nature.