44. Which of the following is not identified in the passage as a factor that contributes to the increase of soil organic carbon (SOC)? (A) The presence of soil minerals such as iron oxides and aluminous clays that stabilize organic matter (B) Limited oxygen availability in waterlogged soils that slows down decomposition (C) Warmer temperatures that stimulate microbial activity (D) Increased plant productivity resulting from higher levels of precipitation