i have hw on philosophy

P1: If SA, then engineers as such can determine whether a level of risk is acceptable to the public.

1a: If SA, then engineers as such ought to ensure that risk is acceptable to the public.

1b: If engineers as such ought to ensure that risk is acceptable, then engineers as such can determine whether a level of risk is acceptable.

P2: Engineers as such cannot determine whether a risk is acceptable to the public.

2a: Determining whether a risk is acceptable to the public requires expertise in various social sciences.

2b: Engineers as such lack expertise in social sciences.

C: Standard Approach is mistaken.