What are the two statements that together prove that: "Sandy is a country music singer."?
Sandy sings in a band; Sandy likes country music the best; Difficult music such as country and classical require a strongly trained voice; Sandy’s band plays country songs; Sandy has attended singing lessons for many years
The two statements that will prove that Sandy is a country singer are:
Sandy sings in a band.
Sandy's band plays country songs.
These two statements can be used together to make people believe that Sandy sings country songs. It is true that Sandy may like country music the best, but there are also some people who love country music but are not singers.
Good singers can sing country and classical music with proper training, but how sure are we that Sandy is a good singer? This is explained by the above two statements.