Answer:
c it is
Explanation:
definitely makes more sense than the others in my mind
The correct cause and effect relationship for the sentence given above is ONE CAUSE AND ONE EFFECT.
For the sentence given in the question, the cause is that the speaker forgot his keys and the effect was that he could not enter into his house. A cause can result into an effect and at other times, a single cause can result into multiple effects.
I've got the same problem.
