Purchasing derivatives is a form of speculating

Which of the following would not terminate a properly formed joint tenancy between two co-tenants:

A: Foreclosure on a mortgage or trust deed secured by the interest of one joint tenant; B: Death or permanent incapacity of either joint tenant; C: One of the joint tenants signing a valid contract of sale to convey his interest in the property; D: One of the joint tenants signing a deed of trust, creating a lien against his interest in the property.

The failure of a manufacturer to properly test a product can be a defect in manufacture

Indicate whether the statement is true or false