Answer:
B) Jordan should use the fair value method for 2019 and future years, but should not make retrospective adjustment to investment account
Explanation:
When a company acquires more than 20% but less than 50% stake in another company, such company should be referred to as an associate.
The date on which such control is acquired, goodwill/capital reserve is calculated.
If cost of investments is greater than the company's share in subsidiary's share capital, such excess is attributable to Goodwill. Similarly, for vice versa scenario, it shall be termed as capital reserve.
In the given case, Jordan acquired 30% stake on Jan 1, 2018 and subsequently disposed off 20% stake on Jan 1, 2019. So for the year 2018, Jordan was an associate and should've accounted on equity basis i.e dividends received from it's subsidiary being credited to income statement and Goodwill/Capital reserve being reported.
For the year 2019, Jordan will not be considered an associate since it no longer holds more than 20% stake and thus, it should use fair value as basis for valuation of it's investments.