"under uniform state law, civil liability exists in all of the following circumstances except when"

Option A -- customer margin securities are commingled with those of other margin customers

Explanation:

Uniform State Law Civil Liability provisions protects people from losses emanated from insecurities of interstate commerce, which was due to connection while carrying out the sale of purchase. This law gives right for economic and exchange commission to set some rules and regulations that will prevent people from deceptive and manipulative devices used during sale of purchase.