We have to search the desired topic on the search box in the homepage
<span>If you match the physical properties of a substance you dont know about to the properties of a known substance, you now know what you've got. For example, if you know that compound X is bright yellow and screams when you poke it, an unknown sample that is yellow and screams that you poke it is probably compound X. trust me, im a dog in a suit.</span>
Im not sure about B. but if you can choose mutiple pick C,D,E but if you can shoose only one than pick A
