Which of the Following Statements Is True of the Following $\infty$

Multiple Choice

Which of the following statements is true of the following enamine?

A) The enamine can be made from cyclopentanone + pyrrolidine.
B) It has another resonance structure:

C) It can be acylated at the $\infty$ -carbon of the original carbonyl compound.
D) It can be alkylated.
E) All of the above are true.