At first, I got lost and couldn't think of systematic approach of which statement to start with. You suggested a good way to think about the problem. It's essentially a "Cause and Effect" type of problem. Classifying the end statement (effect) first and then finding Cause... is good approach.
Bolstered means getting support.
The question asked. Which supported (2) which (1) as per the given passage.
The end results are often what which is been supported by factors because we know that it definitely worked. For ex- rain in tropical region supported better cultivation.
Cultivation is the end result supported by rain.
So statement 1 has to be an end result..
The end result as per the passage is the economic well being life style one incurs after graduation.
1) tendency to earn higher grades in university classes
2) economic wellbeing after graduating from university (the end result)
3) being in larger than average university classes
4) receiving better education overall
5) learning from a greater number of academic staff
So, Statement 1 is economic wellbeing after graduating from universityNow what supported this?
=> learning from greater no. Of academic staff. It can be. But how will his direct benefit is connected with academic staff. So no its not the support system.
=> receiving better education, yes it can be a point but still not the direct support which on needed for a well off economic condition.
=> being in larger class, but what are the chances that it will help all for sure?
=> tendency to earn higher grades in university classes, it is the support needed for a better life Style after graduation as stated in passage too. People need good marks to get graduate, academic staff, larger classes all are secondary support. So,this is providing the direct support.
Statement 2 is tendency to earn higher grades in university classesPosted from my mobile device