GIVING BRAINLIEST TO FIRST GOOD ANSWER WITH AN EXPLANATION!! An instrument is gradually lowered beneath the surface of the ocean to measure the temperature and salinity of the water. The graphs below show the change in temperature at each depth in kilometers below the surface.

What is the most valid conclusion regarding ocean temperature based on the data? (3 points)

Select one:
a. Temperature and salinity increase with increasing depth.
b. The temperature at −2.5 km is close to zero, and salinity increases.
c. The bottom of the ocean is frozen and salinity levels are low.
d. The ocean temperature, never rises above 10°C and salinity remains constant.