Please also note that there might be multiple answers for each question.
Q 5
Answer
if A is undecidable then B is undecidable too
Explanation
Lets take the first statement
A decider for language A can be used to decide the language B
It is wrong
the correct one should be
a decider for language B can be used to decide the
language A
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Next statement
If A is decidable then B is decidable too
This is also wrong
for e.g if A is the empty language and B is A, surely it is reducible to A, but It is undecidable
the correct one is
If B is decidable then A is decidable too
--
If A is undecidable then B is undecidable too
This is correct one
so answer is C
--
all the best
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