What type of ownership do Jon and Mathew retain after Henry conveys his interest?

The correct answer is that Jon and Mathew retain joint tenants with survivor rights after Henry conveys his interest. In a joint tenancy, all parties involved have an equal share in the property, and a key feature is the right of survivorship. This means that if one joint tenant passes away, their share automatically transfers to the surviving joint tenants, rather than being passed through probate or transferred according to a will.

In this context, after Henry conveys his interest, Jon and Mathew would continue to hold the remaining interest together with the rights and responsibilities that come with joint tenancy. This conveyance reinforces their status as joint tenants since the structure of the ownership is such that it allows them to retain that form of ownership seamlessly.

The other options don't apply in this context. Tenants in common do not have the right of survivorship, which means that if one co-owner dies, their share would go to their estate rather than the other owners. Leaseholders refers to a form of ownership that involves renting and does not pertain to outright ownership of the property like joint tenancy. Lastly, the option of "none of the above" is not valid since Jon and Mathew clearly maintain a specific type of ownership that is recognized legally.