Answer:
D. A rainstorm interrupted a wedding in a local park, drenching everyone attending.
Step-by-step explanation:
The sentence "The wedding of the bride and groom that was held in a local park was interrupted by an unexpected rainstorm, which drenched the wedding party and the guests" talks of the wedding that was interrupted by the unexpected rainstorm which resulted in everyone getting drenched. So, the correct way to rewrite the whole sentence, while keeping in mind to not miss any detail, but still retain the whole story is option (D).