Final answer:
The Correct option is 1). A speaker can produce any number of Turn Constructional Units (TCUs) during conversational turns; there is no specific required number, as TCUs are managed organically based on conversational flow.
Step-by-step explanation:
When a speaker starts speaking, they are entitled to produce as many Turn Constructional Units (TCUs) as necessary for the conversational turn they are taking. A TCU is not limited numerically, so the answer could vary. In conversation analysis, the end of a TCU is determined by contextual and linguistic cues that signal the possible completion of a turn, and the possible uptake by another speaker. There is no set rule specifying that a speaker must produce a particular number of TCUs; rather, speakers organically manage the number and size of their TCUs according to the demands of the conversation.