If a deed creating a tenancy in common does NOT state the fractional interest of...

In tenancy in common, two or more individuals hold title together, each with an undivided right to possess the property. The co-owners may hold unequal shares, but unless otherwise specified in the deed, the law presumes equal ownership interests.

For example, if three people take title as tenants in common without specifying percentages, Massachusetts law assumes they each own one-third. The deed is not void (A), fractional shares are not decided by “vote” (C), and tenancy in common does not convert into joint tenancy (D) unless explicitly stated with survivorship rights.

Thus, the correct answer is B: presumed equal interest.