Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

A one-year zero-coupon bond yields 4.0%. The two- and three-year zero-coupon bonds yield 5.0% and 6.0% respectively.
If the three-month T-bill rate drops and the Libor rate remains the same, the relevant TED spread:
Option A:increases.
Option B:decreases.
Option C:does not change.

Answer: A