Which Answer Best Describes How Roots Acidify the Soil Solution

Which answer best describes how roots acidify the soil solution?

A) Roots release CO₂ and pump K+ into the soil.
B) Roots release CO₂ and pump H+ into the soil.
C) Roots release NaCl and pump Na+ into the soil.
D) Roots release NaCl and pump Cl- into the soil.