during 1915 and 1917, u - boats attacked not only enemy ships but also\ntroops stationed close to…

during 1915 and 1917, u - boats attacked not only enemy ships but also\ntroops stationed close to shore.\ncities near the shoreline.\ngerman submarines.\ncommercial supply ships.
Answer
Answer:
D. commercial supply ships
Brief Explanation:
During WWI, German U - boats targeted commercial supply ships to disrupt Allied supplies.