The machine is making less liquid oxygen than normal. What is wrong?

A) There was frozen water in tank 2, which is blocking some of the oxygen from going into tank 3

B) Some of the liquid oxygen evaporated in tank 3

C) Some of the oxygen didn't condense in tank 2

you can't see the options

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.

a) carbon, hydrogen

b) carbon, hydrogen, oxygen, nitrogen

c) carbon, hydrogen, oxygen, nitrogen, phosphorus

d) sugar

e) amino acid

f) nucleotide