A 28yearold female is seen by a genetic counselor during her second pregnancy because she reports that her first pregnancy was diagnosed with thanatophoric dysplasia. No records are available to confirm this. In order to substantiate the diagnosis, it is BEST to ask whether the fetus had which of the following in addition to shortened limbs?

A. cloverleaf skull
B. fractures
C. ambiguous genitalia D. polydactyly