Final answer:
The correct adjective to describe a top without arms in fashion terminology is 'sleeveless', not 'armless'. 'Sleeveless' refers to garments that expose the arms by lacking sleeves. Option b is the correct answer.
Step-by-step explanation:
The adjective that describes a top without arms is sleeveless. When referring to clothing, sleeveless implies that the garment does not have sleeves and therefore exposes the arms, such as in a tank top or a sleeveless dress. On the other hand, armless is not commonly used in fashion to describe clothing; it more typically refers to something or someone lacking arms entirely.