Explanation:

Statement 1: The art of bronze-casting was practised on a wide scale by the Harappans.Their bronze statues were made using the ‘lost wax’ technique.
Statement 2: The stone statuaries found at Harappa and Mohenjodaro are excellent examples of handling three dimensional volumes.The arts of the Indus Valley Civilisation emerged during the second half of the third millennium BCE.The forms of art found from various sites of the civilisation include sculptures, seals, pottery,gold jewellery, terracotta figures etc.
Statement 3: Archaeologists have discovered thousands of seals, usually made of steatite, and occasionally of agate, chert, copper, faience and terracotta, with beautiful figures of animals, such as unicorn bull, rhinoceros, tiger, elephant, bison, goat, buffalo, etc.Some seals have also been found in gold and ivory. They all bear a great variety of motifs, most often of animals including those of the bull.
Statement 4: The bead industry seems to have been well developed as evident from the factories discovered at Chanhudaro and Lothal. Beads were made of cornelian, amethyst, jasper, crystal,quartz, steatite, turquoise, lapis lazuli, etc.Metals like copper, bronze and gold, and shell, faience and terracotta or burnt clay were also used for manufacturing beads.