I feel that the answer is 3 because it 1; explains what the paragraph is talking about and 2; explains what is needed to keep the lawn healthy and in well condition.
How much the audience already knows about an event
Wax is mostly susceptible to heat.
This means that when wax is found somewhere warm or hot, in a generally heated location, it will melt because it is made of material susceptible to high temperatures and humidity. So, unless you want wax or candles to melt, keep them somewhere cool.
