It is "could be" question...
The answer choice is a possible scenario. It must not be true!
No where in the argument, the author is saying that the coal mined in 1990 is used in 1991!
If the coal mined in 1990 is not usable due to some reasons, then option B will not be true!
To arrive at answer choice B, you have to assume that the coal produced in 1990 can be used in 1991! Hence this is "could be true" question -- not "must be true question.
We should be wary about
...
The answer choice is a possible scenario. It must not be true!
No where in the argument, the author is saying that the coal mined in 1990 is used in 1991!
If the coal mined in 1990 is not usable due to some reasons, then option B will not be true!
To arrive at answer choice B, you have to assume that the coal produced in 1990 can be used in 1991! Hence this is "could be true" question -- not "must be true question.
We should be wary about
...
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