Critical Reasoning (CR) | Re: Last year all refuse collected by Shelbyville city services was incine

I chose last line as conclusion :'This year city services will separate for recycling enough refuse to reduce the number of truckloads of refuse to be incinerated to half of last year's number.'

and then chose C] to strengthen the above conclusion.

how do I identify whether the 'truckloads will be reduced to half' is a premise or a conclusion?

---