You are presented with the quiz "What is the liquid portion of the blood formed by?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "plasma is formed by electrons separating from atoms in stars" and "plasma Is the liquid portion of the blood". So, what's the best answer to the question?

pick from the following.
[1]. Evaporation of water
[2]. basic building blocks of life
[3]. flow of electrons
[4]. Veins and arteries.
[5]. electrons separatin from atoms
[6]. Something made from fermented ricce
[7]. circulatory systems
[8]. heat production
The answer is:
[5].