According to our textbook, the is a reoccurring theme or motif found throughout the book of Ecclesiastes.

Remembering God, life under the sun, sovereignty of God, wisdom and enjoyment of life.

Explanation:

The Book of Ecclesiastes is the 21st book in the Old Testament of the Holy Book. It contains 12 chapters, all of which have the recurring themes of life's meaninglessness and the sovereignty of God.

From the very first chapter of the book, the author, King Solomon delves into how meaningless human life is without God. He stresses the life of man under the sun, where all things seem meaningless unless living with God. He also focuses on the need to remember God and his great nature, his ever providing nature. He states in Chapter 2: 24-25, "A person can do nothing better than to eat and drink and find satisfaction in their own toil. This too, I see, is from the hand of God, for without him, who can eat or find enjoyment?" In chapter 6:2, he says "God gives some people wealth, possessions and honor, so that they lack nothing their hearts desire, but God does not grant them the ability to enjoy them, and strangers enjoy them instead. This is meaningless, a grievous evil". And in chapter 8:17, he states "I saw all that God has done. No one can comprehend what goes on under the sun".

b would have to be the answer