Which bomb provides deeper penetration than the BLU-113 and is used with the GBU-28C/B?

The BLU-122 is specifically designed to deliver deeper penetration capabilities compared to the BLU-113, making it an optimal choice for use with the GBU-28C/B. This capability is critical when targeting hardened structures or deeply buried facilities, where a conventional bomb might not achieve the desired effect. The BLU-122 incorporates advanced design features that enhance its ability to penetrate armor and reinforced concrete, thereby increasing its effectiveness during combat operations.

This specialized performance characteristic is particularly important for missions that require precision and the capability to breach fortified targets, illustrating why the BLU-122 is the correct answer in this context.