In Christianity, the sky, sea, animals and other living things came into being through
Creation
Answer: D. God's command
In the Christian creation account (Genesis 1), God spoke and things came into existence — "And God said, Let there be light, and there was light." Everything was created by God's command (His spoken word). The lesser gods are a concept in Traditional Religion, not Christianity. Natural order and laws of God are not how the Bible describes the act of creation itself.