The MOST Likely Source for the Sulfur Compounds in the Clouds

Multiple Choice

The MOST likely source for the sulfur compounds in the clouds above the surface of Venus appears to be

A) intense wind storms that have carried surface dust high into the atmosphere.
B) meteoritic material that burned up as it fell into the Venusian atmosphere.
C) recent eruptions of volcanoes, spewing gases and dust high into the atmosphere.
D) the solar wind, having been captured by the intense magnetic field of the planet.