C. They are unlikely to follow conventional paths in life.
Explanation:
Answer C
Correct. The author tells the Class of 1990 that they “need not, probably cannot, live a ‘paint-by-numbers’ [formulaic or conventional] life” because they “have a first class education from a first class school.” She uses this as an opportunity to offer her audience advice on how to approach the unconventional lives they should look forward to by asking them to “consider making three very special choices”: to “believe in something larger than yourself,” to find “the joy in life,” and to “cherish your human connections.”