$\backslash$table$[[,$rOutput,Fixed,Variable,Total,Margii,al Average,Average$],[,,$Cost,Cost,Cost,Cost,Variable Cost,Total Cost$],[0,0$ units,,$$0,$$$35,000,,,],[1,\backslash$table$[[1,000],[$units$]],$A$,,,,,$D$],[2,\backslash$table$[[2,500],[$units$]],,,,,,],[3,\backslash$table$[[5,000],[$units$]],,$B$,,,,],[4,\backslash$table$[[8,000],[$units$]],,,,$C$,,],[5,\backslash$table$[[12,000],[$units$]],,,,,,],[6,\backslash$table$[[17,000],[$units$]],,$$$48,000,,,,],[,\backslash$table$[[21,000],[$units$]],,,,,$E$,]]$

Assume that labor is the only variable input and that all workers are paid equally.

What is the value of $"D"($the average total cost when $1,000$ units are produced$)?$

a$.$ an amount less than $$45$

b$.$ an amount between $$45$ and $$60$

c$.$ an amount between $$60$ and $$75$

d$.$ an amount between $$75$ and $$90$

e$.$ an amount between $$90$ and $$105$