Answer:
B). This lecture will be fascinating, so get your tickets before they disappear!
Step-by-step explanation:
The sentence that best employs the verb mood to convince the audience to go and buy tickets at their earliest is displayed in option B. Mood of the verb is very much crucial to deliver the intended meaning to the audience and evoke desired reactions or response from them. Thus, option B effectively influences the audience by exciting them that the lecture would be 'fascinating' and persuade them to buy the tickets. The author intentionally and positively adds a sign to buy them(tickets) quickly by the inclusion of phrase (before they disappear), as it offers an indication. Thus, option B positively uses the verb mood which persuades the readers.