As per Indian Standard, the modular size of bricks is-

Correct option is D

Modular Size of Bricks as per IS:
As per Indian Standard IS 1077:1992, the modular size of bricks is specified as: 19 cm×9 cm×9 cm19
Why Modular Size?
Modular bricks are designed to standardize construction and ensure uniformity.
With 10 mm thick mortar joints, the brick size becomes 20 cm × 10 cm × 10 cm, making it easy to calculate dimensions in masonry works.