The answer that bubbles to the top of this group is A. "Effervesce" combines the Latin prefix "ex-," which means "from" or "out of," with a form of the Latin verb "fervere," which means "to boil." If you've ever been sprayed by a cold carbonated drink, though, you know that whatever effervesces doesn't have to be boiling hot to bubble over. Some other English words that can also be traced back to "fervere" include "fervent," "fervid," and "fervor." A fervent or fervid person exhibits great fervor and can be thought of as bubbling over with warmth, feeling, or eagerness.