By saying 'at no time of the year are thank-you notes more visible than June' the writer means______.
A.
thank-you notes can be more easily noticed in the month of June
B.
thank-you notes can be displayed to the brides or at graduation and summer parties
C.
June is the month full of interaction, yet we don't write enough thank-you notes
D.
it's better to send thank-you notes in the month of June