The correct answer is: C. had just swallowed
The woman came in with a baby who, she said, had just swallowed a safety pin. This means that the baby had swallowed the safety pin a short time before the woman brought the baby to the hospital. The woman’s statement is important because it tells the doctors how long ago the baby swallowed the safety pin. This information is important because it helps the doctors determine how to treat the baby.
The other options are incorrect because they do not accurately describe the woman’s statement. Option A, was just swallowing, is incorrect because it implies that the baby was still in the process of swallowing the safety pin when the woman brought the baby to the hospital. Option B, swallowed, is incorrect because it does not specify when the baby swallowed the safety pin. Option D, just swallowed, is incorrect because it implies that the baby swallowed the safety pin very recently, when in fact the baby had swallowed the safety pin a short time before the woman brought the baby to the hospital.