The diagram shows the thermohaline circulation, also know as the ocean's conveyor belt.

Which statement is true about the red currents?
A. Water in the red currents contain less salt.
B. Water in the red currents receive less sunlight
C. Water in the red currents is colder
D. Water in the red currents is denser

The statement that is true about red currents in the thermohaline circulation is that  water in the red currents contain less salt (option A).

Explanation:

Thermohaline circulation is a concept used in oceanography, referring to the oceanic circulation that depends on factors such as surface heat and salinity, as well as the density gradient that they determine.

On a map, the different currents that are part of the thermohaline circulation are usually represented with blue and red lines, where:

The red currents (see image) represented on the map have less salt content, compared to the currents represented in blue.

Learn more:

Thermohaline circulation link