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: C

Rationale: Petroleum jelly is recommended to prevent the diaper from sticking to the circumcised area, reducing irritation and promoting healing. It should be applied during every diaper change until the site heals.

Correct Answer: D

Rationale: Early decelerations are typically caused by head compression during contractions, which is a normal response and often indicates that the fetus is descending into the birth canal.

Correct Answer: D

Rationale: The nurse should assist the client into the knee-chest position to relieve pressure on the umbilical cord. This position helps to prevent cord compression and improves fetal oxygenation.

Correct Answer: A

Rationale: Premature ovarian failure affects fertility by leading to reduced or absent ovarian function, resulting in decreased estrogen production and irregular menstrual cycles.