The correct answer is C) Cracks. The dimples of a combustor dome band that has a low operating time will usually develop cracks. This is because the combustor dome band is exposed to high temperatures and pressures during operation, which can lead to thermal and mechanical stresses on the material. Over time, these stresses can cause the dimples to develop small cracks, even at relatively low operating times. The other answer choices, such as the dimples burning away (A), bowing (B), or burning through (D), are less likely to occur with a low operating time and are more indicative of more severe damage or longer-term operation.