George Alexander pays $9,300 in tuition and fees in December 2022, and his child began college in January 2023. He filed his 2022 tax return on February 14, 2023, and claimed a Lifetime Learning Credit of $1,860. He claimed no other tax credits. After he filed his return, his child withdrew from two courses and George received a refund of $2,900. He must refigure his 2022 Lifetime Learning Credit using $6,400 of qualified education expenses instead of $9,300. After George refigures the credit, he determines his tax liability increased by what amount?

a)$0

b)$580

c)$1280

d)$1860