Which statement describes the range of possible carbon skeleton forms?

• A. Rings only
• B. Straight, branched, or rings
• C. Spheres only
• D. Chains with cycles only

Answer: (B)

Carbon skeletons can take several forms because carbon can bond in different patterns to build long chains, branches, or ring structures. This flexibility means you can have straight chains, branched chains, or rings, and many molecules combine these features in complex ways (like multiple rings or fused rings). The option that lists straight, branched, or rings best captures this full range of possibilities. The other choices are too restrictive or off-base: rings only excludes straight and branched forms, spheres is irrelevant, and chains with cycles only implies a more limited subset and misses branching and other ring patterns.