Which of the following best describes Chuck Close's painting?

The answer correctly identifies that Chuck Close's painting focuses on the illusion of form, particularly in relation to the head and facial features. Close is renowned for his unique approach to portraiture, in which he often employs a grid technique. This method helps him to meticulously build up areas of color that contribute to the illusion of three-dimensionality and depth within his subjects. His paintings can appear abstract from a distance, but as one approaches, the detailed arrangements of color reveal themselves as a detailed and realistic portrayal of the human face.

In addition, the other options, while they may reflect aspects of portraiture in general, do not accurately encapsulate the distinctive qualities of Close's work. His art does not primarily rely on vibrant colors to create an atmosphere, and while symmetry can be a component of portraiture, his focus is more on the complex interplay of color and form rather than mere symmetry. Lastly, although backgrounds can be significant in many artworks, Close’s emphasis is often on the intricacies of the subject’s face itself, making the background less crucial in the context of his overall composition.