Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

John Thronen is an analyst in the research department of an international securities firm. He is preparing a research report on Topmaker, Inc., a publicly traded company that complies with IFRS.On 1 January 2016, Topmaker invested $11 million in Blanca Co. debt securities (with a 5.0% stated coupon on par value, and interest payable each 31 December). The par value of the securities is $10 million, and the market interest rate in effect when the bonds were purchased was 4.0%. Topmaker designates the investment as held to maturity. As of 31 December 2016, the fair value of the securities is $12 million.Blanca Co. wants to raise $40 million in capital by borrowing against its financial receivables. Blanca plans to create a special-purpose entity (SPE), invest $10 million in the SPE, have the SPE borrow $40 million, and then use the funds to purchase $50 million of receivables from Blanca. Blanca meets the definition of control and plans to consolidate the SPE. Blanca's balance sheet is presented in Exhibit 1.
| Exhibit 1.Blanca Co.Balance Sheet at 31 December 2016(S mill ons) |
| Cash | 20 | Current liabilities | 25 |
| Accounts receivable | 50 | Noncurrent liabilities | 30 |
| Other assets | 30 | Shareholders'equity | 45 |
| Total assets | 100 | Total liabilities and equity | 100 |


Also on 1 January 2016, Topmaker acquired a 15% equity interest with voting power in Rainer Co. for $300 million. Topmaker has representation on Rainer's board of directors and participates in Rainer's policymaking process. Thronen believes that Topmaker underestimated the goodwill and balance sheet value of its investment account in Rainer. To estimate these figures, Thronen gathers selected financial information for Rainer as of 31 December 2016 in Exhibit 2. The plant and equipment are depreciated on a straight-line basis and have 10 years of remaining life.
| Exhibit 2.Selected Financial Data for Rainer Co., Year Ending 31 December 2016 |
| Book Value | Fair Value |
| Revenue | 1，740 | N/A |
| Net income | 360 | N/A |
| Dividends paid | 220 | N/A |
| Plant and equipment | 2，900 | 3，160 |
| Total assets | 3，170 | 3，430 |
| Liabilities | 1，830 | 1，830 |
| Net assets | 1，340 | 1，600 |


During 2016, Rainer sold $60 million in inventory to Topmaker for $80 million. In 2017, Topmaker resold the entire inventory to a third party.Thronen is concerned about possible goodwill impairment resulting from expected changes in the industry effective at the end of 2017. He calculates the impairment loss based on the projected consolidated balance sheet data shown in Exhibit 3, assuming that the cash-generating unit and reporting unit of Topmaker are the same.
| Exhibit 3.Selected Financial Data for Top maker， Inc.， Estimated Year Ending 31December 2017(S millions) |
| Carrying value of cash-generating unit reporting unt15，200Recoverable amount of cash-generating unit/reporting unit14，900Fair value of reporting unit14，800Identifiable net assets14，400Goodwill520 |


Finally, Topmaker announces its plan to increase its ownership interest in Rainer to 80% effective 1 January 2018. It will account for the investment in Rainer using the partial goodwill method. Thronen estimates that the fair market value of the Rainer's shares on the expected date of exchange is $2 billion, with the identifiable assets valued at $1.5 billion.
Topmaker's influence on Rainer's business activities can be best described as:
Option A:significant.
Option B:controlling.
Option C:shared control.

Answer: A