Answer:
Since Timothy is married (and probably files as married filing jointly) can use $290,000 (half of the total loss) to offset nonbusiness income.
On the other hand, since Prada is single, she has an excess business loss of $40,000 ($290,000 - $250,000). She can only use $250,000 (part of her share of the loss) to offset nonbusiness income. The remaining $40,000 must be carried forward and may be used in the future.