assets and liabilities

A company had the following transactions:
1 Goods in inventory that had cost $1,000 were sold for $1,500 cash.
2 A credit customer whose $500 debt had been written off paid the amount in full.
3 The company paid credit suppliers $1,000
What will be the combined effect of these transactions on the company’s total net assets (current assets
less current liabilities)?
A Increase of $1,000
B Net assets remains unchanged
C Increase of $2,000
D Increase of $3,000

sir, how is option A correct??
from 1, our assets increased by 500 and from 2, 500. In third , our liability is decreased by 1000.. so cash is reduced in paying liability . so, i got option 2 ans