Final answer:
Fuel cells are not noisy, have low emissions, are modular, and highly efficient. Option A is correct.
Step-by-step explanation:
The correct answer choice is A, 'The noise level is very high.' Fuel cells do not produce high levels of noise because they operate silently without moving parts.
On the other hand, the other answer choices are correct for fuel cells:
B. The emission level is much below the permissible level: Fuel cells produce clean electricity and have lower emissions compared to traditional internal combustion engines.
C. They are modular: Fuel cells can be combined to create larger power systems, and their modular design allows for scalability and flexibility in various applications.
D. They are highly efficient: Fuel cells have higher efficiency compared to internal combustion engines, converting chemical energy into electrical energy with efficiency ranging from 40% to 60%.