Two identical pumps in parallel, compared with one, at a common system curve (conceptual) tend to (which behavior)?

Choices

• (A) Each pump runs on its “solo” BEP always
• (B) Double the head in all GPM
• (C) Halve the flow in all systems
• (D) Add flows at a given head intersection with the system curve, but with reduced per-pump GPM+avoid low-flow stall if poorly selected