The compressive strength range for some concrete types can be:

The selected range of 100 to 1000 lb/sq in. is correct because it accurately represents the typical compressive strengths encountered in various types of concrete used in construction. Standard concrete mixes can achieve compressive strengths ranging from about 2500 psi (approximately 250 lb/sq in.) for low-strength mixes to around 8000 psi (approximately 800 lb/sq in.) for high-strength concrete.

Concrete used for structural applications generally falls within this range, where common mix designs such as those used in residential foundations or commercial structures might fit neatly into this category. Strength is critical for ensuring the structural integrity and durability of concrete installations.

Other ranges provided in the options either do not align with typical standards or exceed realistic compressive strength values for conventional concrete types. Therefore, the range chosen reflects both standard engineering practice and commonly accepted concrete strengths.