Which of the following is the correct order of boiling points for $(1^o)$ primary,$(2^o)$ secondary,and $(3^o)$ tertiary alcohols?

• A
  $1^o > 2^o > 3^o$
• B
  $3^o > 2^o > 1^o$
• C
  $2^o > 1^o > 3^o$
• D
  $2^o > 3^o > 1^o$