Answer:
C) $3,090,000.
Explanation:
The married couple can give to each son or daughter $26,000 per year x 2 children x 5 years = $260,000
The married couple can give to each grandson or granddaughter $26,000 per year x 5 grandchildren x 5 years = $650,000
Their total tax free gifts = $260,000 + $650,000 = $910,000, so their estate will reduce to: $4,000,000 - $910,000 = $3,090,000