Choose the sentence from this excerpt that confirms the value to marine scientists of underwater microphones called hydrophones.
A. They notice a thick layer near the surface; this is probably the migrating zooplankton.
B. This acoustic technology allows marine scientists to more quickly survey an area to get an idea of the organisms found there.
C. But this is only useful if they know what images are associated with each type of organism.
D. To confirm this, they must take physical samples of organisms in the survey area.
The correct answer is B. This acoustic technology allows marine scientists to more quickly survey an area to get an idea of the organisms found there.
Explanation: This sentence directly highlights the advantage of using hydrophones, which is that they enable marine scientists to efficiently survey an area to gather information about marine life, showcasing the value of this technology in their research.