Choose the best translation."پژوهش حاضر که یک مطالعه توصيفي – تحليلي است كه به روشControl Case در سال ۱۳۹۶-۱۳۹۷ انجام شده است".

The best translation of the provided Persian phrase is:

"The present research, which is a descriptive-analytical study conducted using the Control Case method in the years 2017-2018."

This translation captures the essence of the original text while providing clarity in English. Here's a breakdown of the key elements:

1. **"پژوهش حاضر" translates to "The present research," indicating that the study is ongoing or recent.
2. **"یک مطالعه توصيفي – تحليلي" translates to "a descriptive-analytical study," describing the nature of the research methodology.
3. **"كه به روش Control Case" translates to "conducted using the Control Case method," specifying the methodological approach.
4. **"در سال ۱۳۹۶-۱۳۹۷" translates to "in the years 2017-2018," providing the specific time frame of the study based on the Persian calendar.

The translation maintains the structural integrity and meaning of the source sentence while ensuring it reads fluently in English.