Questions when filling in I485

I am filling in the I485 form, a couple questions to ask you guys. Pls help,

a) Which item is for my case in PART 2, my 140 is EB2 NIW?

b) We received WIC (food support, about $60 per month for three years for my son when we were graduate students), should I choose Yes in Part 3 Item 2?

You have a good weekend