The correct answer should be D. energy.
He was one of the first abstract painters and there wasn't much pathos there, not many emotional things. Lines and shapes were often use but they weren't the aim of it, rather just a part of the form. He portrayed energy flowing, moving, changing, things like that were fascinating to him.
Your on brainy the site created for students by students
Rene Descartes is frequently considered the first modern philosopher. His
first publication, Discourse on Method (1637), was the touchstone of the
scientific method. A response to the lack of clarity he saw in the world of
science, Discourse describes how scientific study should be prosecuted so
as to achieve the utmost clarity, by using deductive reasoning to test
hypotheses. Descartes explained that the test of an alleged truth is the
clarity with which it may be apprehended, or proven. "I think, therefore I am,"
(cogito ergo sum) is Descartes' famous example of the most clearly apprehended
truth. In effect, the evidence of thought proves the hypothesis of existence.
