Which of the following is the complete subject of the following sentence? All of Shannon's family and friends helped her to celebrate her 50th birthday at Caf© Sorrento.
Correct Answer: C
Rationale: The complete subject in the sentence is 'All of Shannon's family and friends.' This phrase encompasses the entirety of the group involved in celebrating Shannon's 50th birthday at Caf© Sorrento. It includes both her family and friends collectively, highlighting the full extent of individuals who participated in the celebration. The term 'All of Shannon's family and friends' is essential for providing a comprehensive subject that covers everyone who contributed to making the event special. Choices A, B, and D are incorrect because they do not capture the complete scope of individuals involved in the birthday celebration, unlike choice C which encompasses both Shannon's family and friends.