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Electronic configuration of four elements $\mathrm{A}, \mathrm{B}, \mathrm{C}$ and D are given below :
(A) $1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{3}$
(B) $1 s^{2} 2 s^{2} 2 p^{4}$
(C) $1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{5}$
(D) $1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{2}$
Which of the following is the correct order of increasing electronegativity (Pauling's scale)?

• A
  A $<$ D $<$ B $<$ C
• B
  A $<$ C $<$ B $<$ D
• C
  A $<$ B $<$ C $<$ D
• D
  D $<$ A $<$ B $<$ C