The correct answer is B. They are all built on a four-ring structure
Explanation:
Steroids are compounds classified as lipids, these are composed following a four-ring structure that includes seventeen carbon atoms. In biology, steroids play an important role because they are hormones including sex and adrenal hormones besides being essential in biological processes through different functions such as acting as signaling molecules. Besides this, in medicine steroids are used as anti-inflammatory agents that treat and prevent multiple diseases. According to this, the feature all steroids have in common is that they are all built on a four-ring structure.
