Correct Answer: $B.$ $50$
Test suite detects 16 seeded errors with 200 non-seeded errors.
Total seeded errors = 20.
So, When test suite detects 20 errors it will detect = (200/16)*20 = 250 non-seeded errors.
Thus, estimated number of undetected errors in the code = (250 - 200) = 50.