LT v ST target rates

Question

.I am reading Kaplan on LOS 16.k and it says that dec in short term rates also decrease LT rates. Can someone explain why A is the correct answer here since the question stem states "lease likely"? Thanks in advance!A decrease in the target U.S. federal funds rate is least likely to result in:A)a proportionate decrease in long-term interest rates.B)an increase in consumer spending on durable goods.C)depreciation of the U.S. dollar on the foreign exchange market.ExplanationChanges in the U.S. federal funds rate and changes in long-term interest rates are unlikely to be proportionate. Long-term rates are the sum of short-term rates and a premium for the expected rate of inflation. If a decrease (increase) in the target federal funds rate by the Fed causes economic agents to increase (decrease) their inflation expectations, the change in long-term rates will be less than the change in the federal funds rate. Increases in spending on consumer durables and a decrease in the foreign exchange value of the U.S. dollar are among the expected results of a decrease in the target U.S. federal funds rate. (Study Session 5, Module 16.2, LOS 16.k)