Final answer:
The ABCT FA bn consists of 3 firing batteries with 4 M109A7 Paladin howitzers each.
Step-by-step explanation:
The correct answer is option b) 3 firing batteries, 4 howitzers each, M109A7 Paladin howitzers. In an ABCT (Armored Brigade Combat Team) Field Artillery Battalion, there are typically multiple firing batteries, and each battery is equipped with a certain number of howitzers. The M109A7 Paladin is a self-propelled howitzer used by the U.S. Army.