The Carter Corporation Makes Products a and B in a Joint

The Carter Corporation makes products A and B in a joint process from a single input, R. During a typical production run, 50,000 units of R yield 20,000 units of A and 30,000 units of B at the split-off point. Joint production costs total $90,000 per production run. The unit selling price for A is $4.00 and for B is $3.80 at the split-off point. However, B can be processed further at a total cost of $60,000 and then sold for $7.00 per unit.
-In a decision between selling B at the split-off point or processing B further,which of the following items is not relevant:

A) the $60,000 cost to process B beyond the split-off point.
B) the $3.80 unit sales price of B at the split-off point.
C) the portion of the $90,000 joint production cost allocated to B.
D) the $7 unit selling price for B after further processing.