18. For 2018, Thomas, a single parent, reported the following amounts relating to his investments: Net investment income $7,000 Interest expense on a loan to purchase stocks 2,000 Interest expense on funds borrowed to purchase land for investment 6,000 What is the maximum amount that Thomas could deduct in 2018 as investment interest expense? a. $1,000 b. $2,000 c. $6,000 d. $7,000 19. Referring to the previous question, what is the treatment for the interest expense that Thomas could not deduct in 2018? a. It is lost. b. It cannot be used except as a carry back to previous years. c. It can be carried forward and deducted in succeeding years. d. None of the above