Answer:
The correct option is : D. during the secretory phase
Step-by-step explanation:
The uterine glands, also known as the endometrial glands, are the tubular glands present in the endometrium of the uterus. The appearance of these gland changes during the menstrual cycle.
The luteal phase, also called the secretory phase, is the last phase of the uterine cycle. During this phase, the endometrium is the thickest and the glands are extremely coiled. Also, the uterine glands produce glycogen and glycoprotein rich secretions, during this phase.