Question

to prepare for careers in international development, some graduates are taking a three - pronged approach: studying data science and econometrics; fields that are relevant to impact assessment; learning a foreign language, which can be essential for certain positions abroad; and taking courses in public policy and administration.
choose 1 answer:
a no change
b studying data science and econometrics, fields that are relevant to impact assessment;
c studying data science and econometrics, fields that are relevant to impact assessment:
d studying data science and econometrics: fields that are relevant to impact assessment.

Explanation:

The original sentence uses a colon correctly to introduce the three - pronged approach. However, the first item in the list has an incorrect punctuation. A colon is used to introduce a list, and when there is a non - essential appositive (in this case, "fields that are relevant to impact assessment" is an appositive for "data science and econometrics"), a comma should be used instead of a semicolon.

Answer:

B. studying data science and econometrics, fields that are relevant to impact assessment;