请Rosalinda回答一个485填表的小问题, 万分感激!

NIW 140 and 485 concurrent filing. In Form 485, which answer should I check for Part 2. Application type.

a. an immigration petition giving me an immediately available immigrant visa number....

b. my spouse...

c.
.
.
.
h. other basis of eligibility. Explain.

有人建议选a, 但 I-140 still pending.

Thank you so much!