What type of tubing is effectively flared using rolling-type flaring tools?

The correct answer is that soft copper, aluminum, and brass tubing can be effectively flared using rolling-type flaring tools. This is because rolling-type flaring tools are designed to work with these softer metals, allowing them to produce a well-formed flare without crushing or damaging the material.

Soft copper and aluminum are particularly suitable for flaring because they have the necessary malleability to create a good seal when joined with fittings. Brass, being a softer metal, shares similar characteristics that enable it to be flared using this type of tool.

Other materials listed, such as steel, are typically too rigid for effective flaring with rolling-type tools and would require different methods. Plastic and PVC, on the other hand, do not have the characteristics required for flaring at all since they cannot be formed in that manner. The choice of aluminum alone is too limiting, as it disregards other compatible materials like soft copper and brass that can also be effectively flared.