Answer:
b. As both an increase in the equipment account and an increase in contributions from donated services.
Explanation:
When the flood damages the vehicles there was a loss in the value of the organisation's equipment. The actor of restoring it to its previous state will require an addition to equipment account. So there will be an increase in equipment.
The services provided by the mechanic were free and will be recorded as a donated service. This is an increase in contributions from donated services.
There is no expense recorded as the services were performed for free.