Select the option that can be used as a one-word substitute for the underlined group of words.

The ducks were not afraid of the fast moving water.

Torrent

The option that can be used as a one-word substitute for the underlined group of words is torrent.

• Torrent means a strong and fast-moving stream of water or other liquid.
• Current means a steady flow of water or air in a particular direction.
• Flood means an overflowing of water onto normally dry land.
• Overflow means to flow over the edge of a container or other boundary.

Torrent is the most appropriate word for the given group of words because it specifically refers to a strong and fast-moving stream of water. It is derived from the Latin word torrens, meaning "to pour down."