Answer:
D) normative control.
Step-by-step explanation:
In this case, Lydia is using normative control so as to train her staffs to treat customers with utmost care and provide them with reliable fashion advice.
In order to achieve this, Lydia carefully chooses her staff and appoints people who are attentive, friendly, and have a good fashion sense.
Normative control is a strategy that governs the behavior of employees through the use of beliefs and values called norms rather than the written procedures and policies.