Answer:
I would agree with you:
A
A
B
B
B
Explanation:
If I understand the instructions correctly, then all we have to determine is why the indicative or subjunctive tense is used. Well, if the sentence is written in the indicative (in 1, 2), then the 'thing' exists and real; it is certain. Using the subjunctive (in 3, 4, 5) would indicate that there is uncertainty.
