Answer:
c)Short term capital gain.
Step-by-step explanation:
Since in the question it is mentioned that the land is purchased by Sol as on Feb 12,2018 for $85,000 and the land was sold by Sol as on Jan 31, 2019 for $90,000 in cash
So as we can see the difference in the purchase date and sale date would be less than one year and the transactions related to the capital assets would be termed as capital gain
Since it is less than one year so it is a short term capital gain
Hence, the correct option is c.