........... is the characteristic inflorescence of euphorbiaceae.
Euphorbiaceae, the spurge family, in common english sometimes called as euphorbias which is also the name of a genus in the family. It is a large family of flowering plants. The genera in tribe Euphorbieae, subtribe Euphorbiinae show a highly specialized form of pseudanthium or false flower made up of several true flowers called a cyathium. This is usually a small, cup-like involucre consisting of fused-together bracts and peripheral nectary glands, surrounding a ring of male flowers, each a single stamen. In the middle of the cyathium stands a female flower, a single pistil with branched stigmas. This whole arrangement resembles a single flower.
Therefore, the correct answer is option C.