Please choose the correct ending to complete the given sentence: Building sandcastles: A group of kids are at the beach, trying to build a sand castle. they

Ending1: build a small green, grassy hill covered with snow. Ending2: surf back and forth across the waves while adults watch. Ending3: build two walls of sand, while behind them people cull sand and soak in the tub. Ending4: gather sand and pack it around the center.

Answer format: ending1/ending2/ending3/ending4