Who: used for subject
Whom: used for object
1) Here "janice" is object so whom should be used. Option a and e out.
2) Event occurred in past hence 'met'. Option d out
3) we need article before the noun "business trip". Hence option B
Whom: used for object
1) Here "janice" is object so whom should be used. Option a and e out.
2) Event occurred in past hence 'met'. Option d out
3) we need article before the noun "business trip". Hence option B








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