单项选择题

如今,能为他的这本散文集作序,我觉得很荣幸。______

A.I am asked to write a preface to this collection of his essays and I find it a great honor.
B.I am able to write a preface to this collection of his essays and I feel it a great honor.
C.Being able to write a preface to this collection of his essays, I feel greatly honored.
D.I find it a great honor to be asked to write a preface to this collection of his essays.