Final answer:
The correct statement indicating understanding of food interactions with ferrous sulfate is to take it on an empty stomach with orange juice.
Step-by-step explanation:
To indicate understanding of the teaching about food interactions with ferrous sulfate, the correct statement is b) "I'll take it on an empty stomach with orange juice."
Ferrous sulfate is an iron supplement used to treat iron deficiency anemia. It is best absorbed on an empty stomach to avoid food interactions that can decrease absorption. Taking it with orange juice is recommended because the Vitamin C in orange juice enhances iron absorption.