Which of the following relations is true based on the partial pressure and mole fraction?

• A
  $p_t = \chi_1 \times T$
• B
  $p_i = \chi_i \times p_{\text{total}}$
• C
  $\frac{p_i}{\chi_i} = V$
• D
  $p_i \chi_i = p_{\text{total}}$