Answer:
The correct answer is "look up results of tests conducted by environmental agencies"
Step-by-step explanation:
The only way to ascertain/disprove a claim is to conduct an experiment in the light of the claim but in this case, it will be very expensive to carry out experiments on all insecticides claiming to be safe for use around animals and children. The most reliable and cost effective thing to do is to check out environmental agencies and see there results on tests they have independently carried out on these insecticides to make an informed conclusion.