Answer
Secondary
Work Step by Step
1) Identify the carbon atom directly attached to the "OH" group
2) Then count the number of alkyl groups connected to this carbon atom ( Hydrogen atoms does not count )
1 substituent - primary
2 substituents - secondary
3 substituent - tertiary
In this example carbon atom carrying "OH" group has TWO bonds to other alkyl groups and only one "H" atom, that is why it is secondary
