Answer: C) it was not relevant to the topic
Explanation: The material collected for speech made by Hector was related with the topic of space tourism but when he started his speech with the question regarding the dwarf star,it created confusion to the audience.
The audience can understand that speech example at the start and the topic on which Hector is giving speech are not related with each other and thus, did not make sense.
Other options are incorrect because it was non-relevant rather than weird. It was not scientific or long.Thus, the correct options is option (C).