In the Past 30 Years,more Than 16,000 Meteorites Have Been

In the past 30 years,more than 16,000 meteorites have been found in Antarctica due to several favorable conditions.Which of the following is not a contributing factor?

A) The magnetosphere buffers the planet but is weakest at the poles where most meteorites pass easily through the atmosphere.
B) Antarctic ice is 700,000 years old or more,therefore any meteorites striking it are preserved as if they were in a freezer.
C) Antarctic ice is very dense and anything falling on it does not sink very far into the ice.
D) Meteorites encased in ice are protected from carbonic acid,and plant chemicals that would decompose them elsewhere.