Final answer:
To reduce breast tenderness during the first trimester of pregnancy, the nurse should recommend wearing a supportive bra. While applying warm compresses, avoiding caffeine, and breast massage may also help, a supportive bra offers the most consistent relief.
Step-by-step explanation:
To alleviate breast tenderness during the first trimester of pregnancy, a nurse should provide various instructions to the client. Among these, the most beneficial measure would be B) Wear a supportive bra, which provides support to the enlarging breasts and can help minimize movement and discomfort. Applying warm compresses could help in some cases, but wearing a proper bra generally offers more consistent support throughout the day. Avoiding caffeine intake and performing breast massages are other considerations, though less directly related to mechanical support.
Caffeine intake may contribute to breast tenderness, therefore reducing it could theoretically provide relief. Similarly, gentle breast massage may help alleviate tenderness by improving circulation and reducing fluid retention, yet it does not offer the sustained structural support that a bra can provide.