The correct answer is A. 15th
Step-by-step explanation:
The phrase "Beware the ides of march" belongs to "Julius Caesar" which is one famous Shakespearean literary work, in this, this expression is used to warn Julius Caesar about a possible danger. The term "ides" refers to the 15th day of most months including October, May, July, and March, although this can also refer to the 13th day of other months. Additionally, it is believed this term is related to the Ancient Roman Calendar and derives from Latn. Considering this, it can be concluded the word "ides" which is the word in bold means "15th".