D-a is the answer can I get braillist
Length of the sheet is given as

width of the sheet is given as

now let say its thickness is "t"
so the volume of the sheet is given as



mass of the sheet is given as

now we have


by solving above we have

so the thickness of sheet will be above
The answer to this questions would be nuclear engineer. The overall career of engineering would require physics as engineers need to know how the overall mechanics of nature affect the way their structure is built.
Hope this helped :D
Same size as object should be the answer, it is a “plane” mirror