Answer:
Descriptive study
Step-by-step explanation:
A descriptive study describes characteristics of the topic being studies. It does not explain the study topic ( as it why it happened or what are its consequences), but it generally explains the subject and its particular, specific characteristics.
Profesor Snyder wants to create a profile on surrogate mothers, describing their age, education, income and other characteristics. He does not question their motives and he does not judge them or forms an opinion on them. His study is purely descriptive and it would probably proceed an explanatory study.