The answer to the question says that the Foundation established by the company has a greater ability to take risk since it has a spending target which is set in order to minimize taxes, which is in contrast to the pension plan, which has to pay defined benefits, which is a legal liability.
However, the question also mentions that the company does not intend to make any additional donations to the Foundation in the future, but is in a good enough financial position to make additional contributions to the pension plan if required.
Since the foundation won’t be getting any additional money from the sponsor (but can solicit for donations from external parties) but the pension plan will get contributions if required, doesn’t that increase the ability of the pension plan to take risk?