Final Answer:
The sentence that contains details suitable for inclusion in a summary is: 5) Flags had to be placed in visible areas at mutually agreed upon locations. because Sentence 5 contains a specific and crucial rule regarding flag placement in the game, making it essential for a summary.
Step-by-step explanation:
In the given passage, sentence 5 provides essential details for a summary as it outlines a specific rule for the game. This sentence communicates a key requirement of the game "Capture the Flag," specifying that flags must be positioned in visible areas at locations agreed upon by both teams.
Including this detail in a summary would offer a concise representation of a crucial aspect of the game's rules. The other sentences either provide general information about the game, describe the visibility of borders, or mention consequences for rule violations.
However, sentence 5 directly addresses a fundamental element of gameplay, making it the most pertinent for inclusion in a summary.
Therefore, the correct answer is option 5