Answer:
full (by painting his house)
Step-by-step explanation:
When Rosco was unable to pay the $1,000 he owed Lyden, Lyden agreed to let Rosco paint Lyden's house in payment. When Rosco finished painting Rosco's house, the original obligation was discharged by full (by painting his house)
Reason -
(i.e. If Rosco is unable to pay $1000 then in that option he painted Lyden's house so he is discharged by painting his house )