Answer is: <span>A. Fracking reduces U.S. dependency on oil and gas from other countries..
Other answers are not bad side of fracking.
</span>Fracking is technique in which rock is fractured by a pressurized liquid and is used in <span>to create cracks in the rock formations through which </span>natural gas<span>, </span>petroleum<span> will flow more freely.</span>
Things go sublime when changing automatically into vapor when it is heated, usually forming a solid figure.
For a p type of semiconductor we need a dopant which is from 13th group in periodic table
Al , B, Ga, In Tl
So the correct element will be In : Indium
The other elements belongs to 15th group and hence will give n type semiconductor
Lead-
<span>Atomic number: </span>82<span>Symbol: </span><span>Pb
Silver-
</span><span>Atomic number: </span>47<span>Symbol: </span><span>Ag
Gold-
</span><span>Atomic number: </span>79<span>Symbol: </span><span>Au</span>