Answer:
they dont know if its good or not
Explanation:
The correct answer is A.
Answer B is a claim -- but it does not provide any supporting evidence or facts to prove its truth. Without supporting evidence it is basically an opinion.
Answer A provides evidence for the claim by listing the many resources that students can access via handheld devices. This statement better proves the truth of the opinion.
How the reader shows that she trusted the stranger is...
C.she invites him into her garden.