Which of the following dates is considered unfavorable for marriage?

The date of August 24 is considered unfavorable for marriage primarily due to its association with the ancient Roman calendar and cultural beliefs. In Rome, certain days were deemed inauspicious for various activities, including marriage. The date August 24 holds significance as it is linked with the destruction of the Temple of Jupiter Stator, a sacred site for many Romans, and it coincides with the festival of the Feriae Augusti, which is a time of solemnity and reflection rather than celebration.

In contrast, the other options do not carry the same negative connotations in Roman or general cultural contexts. For example, November 15 and December 1 are not historically recognized as unfavorable dates for marriage within Roman traditions. Additionally, October 10 also lacks the negative historical implications that are associated specifically with August 24. Thus, the choice of August 24 as an unfavorable date for marriage is rooted in significant cultural beliefs from the ancient Roman era.