Also explain how you got your answer

I think it’s a

First you need to find the moles of NO2:

Mr NO2 = 46
Mass NO2 = 14

moles = mass/mr
= 14/46
= 0.304

this value is for a ratio of 4 since there are 4 NO2

there is only 1 O2 therefore we divide by 4
0.304/4 = 0.0761

mass O2 = moles x mr

= 0.0761 x 32 = 2.43

While unproven, it uses facts to support part of a conclusion. it is still factual and has predictive power, however.