On December 10, 2017, the representative of a national charitable organization contacted the CEO of Wilkie Inc., a calendar year accrual basis corporation, to solicit a $100,000 donation. The CEO presented the solicitation to Wilkie's board of directors on December 19, and the board unanimously authorized the donation. Pursuant to this authorization, Wilkie transferred ownership of 3,973 shares of Gydo Inc. common stock to the charity on March 20, 2018. Wilkie purchased the Gydo stock in 1998 for $71,800 and held it as an investment. On March 20, Gydo common was selling on the NYSE for $25.17 per share. Before consideration of this donation, Wilkie's taxable income for both 2017 and 2018 exceeded $8 million. In which year is Wilkie allowed a charitable deduction for this donation, and what is the amount of the deduction?