Exporters in Country X are facing lower revenues due to a shortage of

Understanding the argument -
Exporters in Country X are facing lower revenues due to a shortage of the large metal shipping containers in which they send their goods by sea to other countries. - Fact
Fewer containers arrive in Country X due to reductions in imports. - Fact
This has meant lost orders, costly delays, and a scramble for alternatives, such as air freight, all of which are costlier. - Fact
Moreover, the revenues of exporters in Country X will probably continue to decline in the near future. - Conclusion.
This is because other countries are likely to find it increasingly unprofitable to export their goods to Country X, and because __________. - reasons to strengthen the conclusion.

Option Elimination -

A. production of shipping containers in Country X is growing rapidly as a response to the shortage - At best, a weakener.
B. shipping companies are willing to move containers from country to country only when the containers are full - ok. As the argument states, "Fewer containers arrive in Country X due to reductions in imports," + "other countries are likely to find it increasingly unprofitable to export their goods to Country X," which means shipping companies will also find it challenging to get the full load and till the time they get it they don't ship. Now, fewer containers arrive at Country X.
C. the cost of shipping alternatives such as air freight is likely to stabilize in the near future - At best, a weakener
D. consumers in Country X are purchasing more products than ever before - how is this linked to the scope of the argument, which is to strengthen the conclusion: the revenues of exporters in Country X will probably continue to decline in the near future? Do we know whether they are consuming domestically produced or imported products? We don't know. An increase in imports seems unlikely as the argument states, "Fewer containers arrive in Country X due to reductions in imports." So, this is out of scope.
E. the worldwide demand for goods made in Country X has only recently begun to rise after a long decline - At best, a weakener.