1) in-depth investigation of a single individual or a small group of individuals, often involving information from a wide variety of sources.
2) method of determining whether an experiment reflects natural conditions.
3) survey involving only people who are likely to confirm the experimenter's hypothesis.
4) study involving multiple subjects who all suffer from the same psychological problems and are given the same experimental treatment.

answer would be b, a tariffs main purpose is to protect domestic production and jobs.

answer; i believe it was by president pranab mukherjee or by the chief justice of kerala high court; ///plz check luck

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."

they produces sugar..

hope this , question was a little open ended