What conclusion can be drawn from the following quote?

A study targeting 540,000 fifteen-year old students found that the happiness levels of Japanese students was ranked 42 out of 47 countries and regions (including Organisation for Economic Co-operation and Development [OECD] countries and partner nations).

Japanese students are relatively unhappy when compared to students from other countries and regions.
Japanese students are relatively happy when compared to students from other countries and regions.
Japanese students’ levels of happiness cannot be compared to the happiness levels of students from other countries and regions.
Japanese students were involved in a study that included students from other countries and regions.

Question

What conclusion can be drawn from the following quote?

A study targeting 540,000 fifteen-year old students found that the happiness levels of Japanese students was ranked 42 out of 47 countries and regions (including Organisation for Economic Co-operation and Development [OECD] countries and partner nations).

Japanese students are relatively unhappy when compared to students from other countries and regions.
Japanese students are relatively happy when compared to students from other countries and regions.
Japanese students’ levels of happiness cannot be compared to the happiness levels of students from other countries and regions.
Japanese students were involved in a study that included students from other countries and regions.