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35/20 - 16/20

Explanation: First make the fractions into improper fractions. 1 3/4 = 7/4, 4/5 = as is. So now the problem is 7/4 - 4/5. Since the problem is asking to rewrite in twenties, multiply 4*5=20. Whatever we do to the bottom we do to the top, so 4*4=16, so now 4/5 = 16/20. 7*5=35, so now 7/4=35/20.

option c (nickel) is not found in earth's crust. the earth's crust basically contains eight (8) elements namely: oxygen, silicon, aluminum, iron, calcium, sodium, potassium and magnesium (listed in order of abundance).