Correct Answer: D

Rationale: A platelet count of 140,000/mm³ is at the lower end of the normal range but can be concerning in pregnancy, especially if there are signs of thrombocytopenia or bleeding.

Correct Answer: B

Rationale: Magnesium sulfate can depress the central nervous system, leading to respiratory depression. A respiratory rate of 10 breaths per minute is below the normal range and requires immediate intervention.

Correct Answer: A

Rationale: Continuous abdominal pain and vaginal bleeding in a client with a history of cocaine use suggest abruptio placentae, where the placenta detaches from the uterus prematurely, posing serious risks to both mother and fetus.

Correct Answer: B

Rationale: Naegele's rule is a standard way of calculating an estimated delivery date (EDD). It involves subtracting three months from the first day of the last menstrual period (LMP), adding seven days, and then adding one year. In this case, subtracting three months from May 4th, 2013, gives February 4th. Adding seven days results in a due date of February 11th, 2014.

Correct Answer: B

Rationale: Clients with phenylketonuria (PKU) must adhere to a strict low-phenylalanine diet to prevent neurological damage. A sliced apple and red grapes are low in phenylalanine, making them safe choices.