In which sentence does the verb agree with the subject?

a. the orchestra performs after this dance routine.

b. the group lift the heavy box onto the truck.

c. a flock of ducks were flying toward the lake.

this is b. how railways dealt with people riding the trains without paying

recent news about two years ago indicates that a polish forestry student by chance unearthed at a depth of about 40cm (16 inches), during digging in a damp polish forest he found a 13-page manuscript into a thermos flask.

greek jew marcel nadjari was a aischwitz slave who witnessed how the nazi's built big death chambers and crematoriums and told how he was forced to escort fellow jews to the gas chambers. he accounts on this manuscript how the nazi's disguised this chambers to look like showers. also, he describes this place as a process of extermination from the chambers to the trains arriving to take the bodies.

the conclusion would be the most affected category scoring