A. Suffering happens to everyone. In times of great joy we easily recognize that our existence is a gift to us.
Human existence is ambiguous.
When we act in freedom, our actions create new consequences. Often our good freedom begets bad results. Some consequences are not immediately obvious, some we ignore, and some we expect will fall on others rather than ourselves. God decided creating humans with freedom was a good thing, even though it proves ambiguous when we misuse that freedom. We would not be better off in a world where only good happened, because whatever creatures might exist there, they would not be us, ambiguous creatures that we are.