D is the correct answer for your question. Maybe I am not sure.
Answer and Explanation:
a. The equation of K of this reaction is shown below:-
3 A + 5 B + 4 C↔5 D + 7 E + F

b. The moles of compound F is shown below:-
3 A + 5 B + 4 C↔5 D + 7 E + F
2 moles
Now, the mole of produced is

Now, we will the value of c by using the above equation

After solving the above equation we will get
0.5 moles
Answer:
The term sink refers to a location of carbon dioxide storage.
Thus option B is correct answer.
Explanation:
The term sink refers to a location of carbon dioxide storage. in carbon cycle where the carbon dioxide stored in the cycle that is called the sink.
in other words sink is also defined as the location of carbon products storage such as coal fossil fuel gases inside the earth is also known as the sink.
Thus sink behaves like the reservoir which stores carbon dioxide in the form of coal gases etc.
Thus option B is correct answer.