Answer:
A. ungallant
The term 'chivalrous' is typically associated with qualities such as honor, courtesy, and gallantry, often used to describe a person's behavior towards others, especially in a polite and respectful manner. The opposite of 'chivalrous' would be 'ungallant', which implies a lack of courtesy, politeness, or consideration for others – essentially the absence of the qualities that 'chivalrous' represents. Therefore, option A, "ungallant," is the correct opposite in meaning to 'chivalrous'.