What type of concrete blocks may be used with an oil tank?

The correct answer is that 4 X 8 X 16 solid blocks may be used with an oil tank. These blocks are specifically sized and designed to provide adequate structural support and stability for an oil tank, meeting the necessary building codes and safety regulations. Solid blocks are preferred because they do not have hollow cores which could weaken the structural integrity and allow for potential moisture or environmental elements to penetrate.

Using this size ensures that they are strong enough to withstand the weight and environmental conditions an oil tank may be subjected to, while also complying with safety standards associated with oil storage. Proper support is vital in preventing accidents and ensuring the longevity of the installation.

The other options, while varying in size and configuration, do not meet the specific standards or recommendations for supporting an oil tank effectively.