A disease spore, such as ringworm, could remain infectious for:Aa dayBan hourCan indefinite amount of timeDa month

To determine the length of time a disease spore like ringworm could remain infectious, it is essential to analyze the nature of fungal spores and their survival outside a host.

1. Nature of Ringworm Spores: Ringworm is caused by fungi, which can produce spores. These spores can survive in the environment for extended periods, often much longer than most bacteria or viruses.

2. Environmental Factors: The infectious period can depend significantly on environmental conditions such as humidity, temperature, and exposure to sunlight. Favorable conditions can allow spores to remain viable for a long time.

3. Duration: Research indicates that ringworm spores can remain infectious for an indefinite amount of time in suitable conditions, meaning they can survive in the environment for months or potentially years until they are exposed to unfavorable conditions or disinfectants.

Final Answer

The correct answer is C: an indefinite amount of time.