Question 1120294
Because the question asks for a single directional answer, this is a one-way test.  Hypothesis testing is about parameters, not statistics.
It is the third,
Ho: mu >=2.1 and Ha: mu < 2.1
The rejection region will be in the left tail, so a left tail test.
Test stat is a t 0.005, df=64, critical value is t<-2.65
t=(x-mean)/s/sqrt(n)
=-0.05/0.08/sqrt(65)
This is -0.05*sqrt(65)/0.08, or -5.039, Reject Ho
p-value <0.0001 or <0.01