Answer:
Option A,$500,000 is correct as shown below.
Step-by-step explanation:
In order to compute the accumulated expenditures on the building during 2017,the actual amount of expenditure incurred of $600,000 is weighted with with relevant months.
Since it took 5 months to complete the construction,applicable months are those months before it as shown thus;
4 months $600,000*4/12=$200,000
3 months $600,000*3/12=$150,000
2 months $600,000*2/12=$100,000
1 month $600,000*1/12=$50,000
The sum of weights=$200,000+$150,000+$100,000+$50,000=$500,000
Hence the correct option is $500,000,option A