A supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained.
Eliza woke up. Today was the day she was moving to London. She rolled out of bed and got dressed. Eliza opened the shutters. It was raining outside. She didn't care. She knew she would have to get used to rainy days. She grabbed her luggage and took the taxi to the NYC airport. It was a Monday. Eliza thought she could handle whatever was thrown at her. Little did she know that was not the case. She thanked the cab driver and left. The airport was crowded that Monday.
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The different spelling of the Safari sign in "The Sound of Thunder" signifies that they have in some way changed the future by disrupting the past (the butterfly Eckels stepped on and brought with him to the present).
The answer is D. The travelers have disrupted history.
Word of mouth through relatives and members in similar groups.