Which of the following additional perils is covered under both the basic form and broad form dwelling policies?

The correct answer is that internal explosion is covered under both the basic form and broad form dwelling policies. This peril is included in the coverage because it can occur in various scenarios, such as explosions from appliances, heating systems, or other internal sources within the dwelling.

The inclusion of internal explosion as a covered peril in both forms of insurance reflects the industry's recognition of the potential dangers associated with these events and the need for protection against the resulting damages. This coverage is crucial because explosions can lead to significant structural damage and personal property loss, which homeowners would want to be insured against.

Other perils, such as the freezing of plumbing systems, falling objects, and the weight of ice, snow, or sleet, are typically covered under the broad form but may not be included in the basic form, which has more limited coverage. Thus, internal explosion stands out as a common coverage feature in both policy types.