Asked by NITARA SEBASTIAN · CARMEL ACADEMY CMI ICSE SCHOOL, CHALAKUDY
Answer: A. Conscientious
Conscientious means careful and hard-working. Split it as con-sci-en-tious: it keeps the 'sci' from 'science' and ends in '-tious'. The other options drop letters from these parts.
Answering after opening this box earns no Practice Points.