The correct answer is the option #1, encaustic. The Romans made portrait paintings from a durable mixture of pigment and hot wax and this mixture was called an encaustic. It is kept molten on a heated palette.
<em>The Romans made portrait paintings from a durable mixture of pigment and hot wax. The mixture was called </em><em>a. encaustic</em><em>.</em>
Explanation:
<u>Encaustic painting</u> was a paiting technique in which hot liquid beeswax were mixed with pigments. The resulting liquid or paste was then applied to a surface and, afterwards, a heating element was passed over this surface to make a uniform film.