Answer: (B)
Explanation: Decreases the number of bases in the sequence.
In order: B, D, A, A, A. C, A
Answer: 5.14 moles
Explanation:
heat supplied: 8280 J
The formula used for heat absorbed by an ideal gas:

where,
q = heat absorbed = 8280 J
= for monoatomic gas = 
n = number of moles
R = gas constant = 8.314 J/Kmol
= initial temperature = 206 K
= final temperature = 335 K
Now put all the given values in the above formula,


Thus there are 5.14 moles of gas in the container.
I believe the correct answer is A