Solution

The Asteraceae or Compositae are an exceedingly large and widespread family of flowering plants (Angiospermae). The main feature of the family is the composite flower type in the form of capitula surrounded by involucral bracts. The name Asteraceae comes from Aster, the most prominent genus in the family, that derives from the Greek, meaning star and is connected with its inflorescence star form. As for the term Compositae, more ancient but still valid, it obviously makes reference to the fact that the family is one of the few angiosperm ones to have composite flowers. Euphorbiaceae, Fabaceae and Malvaceae family names are not based on their inflorescence.
Therefore, the correct answer is option B.