Mike and Sandy Are Two Woodworkers Who Both Make Tables

Mike and Sandy are two woodworkers who both make tables and chairs.In one month,Mike can make 4 tables or 20 chairs,where Sandy can make 6 tables or 18 chairs.Given this,we know that the opportunity cost of 1 table is

A) 1/5 chair for Mike and 1/3 chair for Sandy.
B) 5 chairs for Mike and 3 chairs for Sandy.
C) 1/3 chair for Mike and 1/5 chair for Sandy.
D) 3 chairs for Mike and 5 chairs for Sandy.