The answer is C but i don't know how did they get that ? please explanation

11. In 2018, Carol, a single individual, has TI of $150,000. Included in her Ti are the following items: $18,000 qualified dividend income $19,000 gain from sale of collectible held 2 years $14,000 loss from sale of stock held 4 years $13,000 loss from sale of stock held 5 months $11,000 loss from sale of collectible held 3 years $9,000 gain from sale of stock held 7 months $23,000 gain categorized as unrecaptured Section $ 8,000 STCL carryover from 2017 1250 gain $12,000 LTCL carryover from 2017 $25,000 gain from sale of stock held 2 years What is Carol's net capital gain for 2018 (be very specific)? a. $36,000 ($7,000 LT25, $29,000 LT15) b. $36,000 ($18,000 LT25, $18,000 LT15) c. $18,000 ($7,000 LT25, $11,000 LT15) d. $18,000 (all LT25) e. None of the above