The chart shows Allied and neutral shipping losses in early 1917. A graph titled Allied and Neutral Shipping Losses, 1917. The x axis shows months, from January to April. The y axis shows tons of goods lost, from 0 to 1,000,000. The line starts at 390,000 in January, to 550,000 in February, 600,000 in March, 900,000 in April. What most likely caused an increase in lost goods? Germany attacked US ports to stop ships from supplying the Allies, doubling the amount of lost goods in four months. Germany sank merchant ships bringing supplies to the Allies, doubling the amount of lost goods in four months. Germany confiscated merchant ships trying to reach the Allies, doubling the amount of lost goods in four months. Germany forced merchant ships trying to reach the Allies to turn around, doubling the amount of lost goods in four months.