Cost and Fair Value Data for the Trading Securities of McMahon

Cost and fair value data for the trading securities of McMahon Company at December 31 2017 are $110000 and $85000 respectively. Which of the following correctly presents the adjusting journal entry to record the securities at fair value? a.
$\begin{array}{llr} \text {Dec. 31 Unrealized Loss - Income. } &25,000\\ \text { Trading Securities. } &&25,000\\\end{array}$

b.
$\begin{array}{llr} \text { Dec. 31 Unrealized Loss - Income. } &25,000\\ \text { Trading Securities. } &&25,000\\\end{array}$

c.
$\begin{array}{llr} \text { Dec. 31 Unrealized Loss - Income. } &25,000\\ \text { Fair Value Adjustment-Trading} &&25,000\\\end{array}$

d.
$\begin{array}{llr} \text {Dec. 31 Unrealized Loss - Income. } &25,000\\ \text { Unrealized Loss-Income. } &&25,000\\\end{array}$