In the Indus Valley Civilisation (about $3000 \, BC$),the bricks used had the ratio of $\ldots \ldots$ for length,breadth,and height,respectively.

• A
  $4: 2: 1$
• B
  $3: 2: 1$
• C
  $4: 3: 1$
• D
  $2: 1: 1$