The correct answer is A: Only 2 and 3.

Statement 2 is correct — Harappans were agrarian, cultivating wheat, barley, peas, and cotton, and used advanced irrigation near the Indus River.

Statement 3 is correct — Harappan seals found at Mesopotamian sites confirm trade, exchanging beads, pottery, and textiles for lapis lazuli, silver, and tin.

Statement 1 is incorrect — Harappan cities like Mohenjo-Daro, Harappa, and Dholavira were highly urban with grid-patterned streets, drainage systems, and public baths.

Statement 4 is incorrect — Harappans had a written script found on seals and pottery, though it remains undeciphered.