Question

select the pronoun whose antecedent is lillian moller gilbreth. not only was lillian moller gilbreth an engineer and a writer, but she was also the mother of twelve children!

Explanation:

To determine the pronoun with antecedent Lillian Moller Gilbreth, we analyze the sentence. An antecedent is the noun a pronoun refers to. In "Not only was Lillian Moller Gilbreth an engineer and a writer, but she was also the mother of twelve children!", the pronoun "she" refers back to "Lillian Moller Gilbreth".

Answer:

she