Which choice correctly combines the sentences?

There had not been any rain for several weeks. The flowers remained healthy.

1. Even though there had not been any rain for several weeks, the flowers remained healthy.

2. There had not been any rain for several weeks because the flowers remained healthy.

3. There had not been any rain for several weeks, and as a result, the flowers remained healthy.

4. Since there had not been any rain for several weeks, the flowers remained healthy.