Answer:
Greta only
Explanation:
The shareholder that will receive the deferral treatment under Section 351 will be Greta
Therefore Immediately after Greta's contribution she will be the person to be in control of 80% or more which means she can controls up to 100% while Bjorn will only controls 16.67% which is (20÷120) after he or she made the transfer in which he may not include his with that of Greta's as a single transfer.