The first year at university was probably the most challenging year of her life, which caused her plenty of troubles. A. tricky B. tough C. easy D. difficult

C

tricky (adj): phức tạp, rắc rối

tough (adj): dai, chắc, bền, cứng cáp, khó nhằn

easy / (adj): dễ dàng

difficult (adj): khó khăn, gay go

Từ được gạch chân: challenging (adj): thử thách, khó khăn

® challenging >< easy → chọn C