You are writing an email to a new classmate to invite them to a study group. Which opening sentence is the MOST appropriate and friendly?
A) 'Hey, join our study group.'
B) 'To whom it may concern, I invite you to study.'
C) 'Hi [Classmate's Name], I hope you're settling in well. We're forming a study group for English, and we'd love for you to join us!'
D) 'You must come to our study group next week.'
E) 'Regarding the study group, your attendance is required.'
