J D Formed Clampett, Inc

Multiple Choice

J. D. formed Clampett, Inc. as a C corporation (calendar tax year) with J. D., Granny, and Jethro, Inc. (a C corporation) as shareholders. On January 15, 2018, Jethro, Inc. sold all its shares to Jane Hathaway. On February 28, 2018, Clampett, Inc. filed an S corporation election, with J. D., Granny, and Jane all consenting to the election. What is the earliest effective date of the S election? 

A) January 1, 2018.
B) January 1, 2019.
C) January 1, 2020.
D) February 28, 2019.
E) Never.