幂级数http://p.ananas.chaoxing.com/star3/origin/53602fe1ba101bcd44fb2c8471fe3e6e.png的和函数是 .

A、http://p.ananas.chaoxing.com/star3/origin/b7c107dfde98f8957f3c1863879d2aad.png
B、http://p.ananas.chaoxing.com/star3/origin/6fc6b5e923044070a2669a456f23be3f.png
C、http://p.ananas.chaoxing.com/star3/origin/9d8a6607d093d72f2e049bdced70f1fb.png
D、http://p.ananas.chaoxing.com/star3/origin/5a1537739f5ba65ef72d3dc5a5c45fcd.png