Correct Answer: Extant

Solution : The second option is the correct answer.

"Defunct" means no longer existing or functioning, while "extant" means still in existence, surviving, or remaining.

The meanings of other options are as follows:

• Stoicism refers to a philosophical school of thought emphasising endurance, self-control, and detachment from emotions.
• Convoluted means complex, intricate, or difficult to follow.
• Redundant means unnecessary or superfluous, often implying repetition or excess.

Therefore, the correct answer is extant.