Final answer:
The correct answer is A) 'I have more than one cousin,' based on the use of commas surrounding the cousin's name, R2-D2, in the given sentence.
Step-by-step explanation:
Based on the sentence 'My cousin R2-D2, an active member of the knitting club, made me a new pair of toe socks,' option A) 'I have more than one cousin' is true. The use of commas around 'R2-D2,' which is an appositive, suggests that it's additional information about the subject and that the name 'R2-D2' specifies which cousin out of potentially more than one is being referred to. Without commas, it could suggest that R2-D2 is the only cousin, as there would be no need to specify further. However, since the sentence does include commas, the implication is that the speaker has multiple cousins.