Answer :
[tex]\huge\underline\mathtt\colorbox{cyan}{One-group pretest-posttest}[/tex]
Explanation:
The one-group pretest-posttest design is a type of quasi-experiment in which the outcome of interest is measured 2 times: once before and once after exposing a non-random group of participants to a certain intervention/treatment.
The objective is to evaluate the effect of that intervention which can be:
A training program
A policy change
A medical treatment, etc.