Final answer:
The term 'sleeveless' is the correct 10-letter word that describes a dress without arm coverings. Options 'strapless,' 'bare-armed,' and 'exposed' do not precisely match the description.
Step-by-step explanation:
The 10-letter word describing a woman's dress without arm coverings is 'sleeveless.' Option a) Sleeveless correctly fits the description. Sleeveless dresses are designed without sleeves, allowing the arms to be uncovered and free. They can have varying necklines and are popular, especially in warmer weather, as they provide comfort and style. On the other hand, 'strapless' b) refers to dresses that do not have straps over the shoulders, 'bare-armed' c) is not a commonly used term to describe a dress, and 'exposed' d) is too general to specifically refer to the sleeve portion of a dress.