Which Words

Which is the correct meaning for these words?

1 MEGALITH

(a) A stone of great size

(b) A unit of computer

memory size

(c) The death of a million persons

2 NAPIFORM

(a) Unknown to fame

(b) Turnip-shaped, as a root (c) Defenceless

3 OPULENT

(a) Taking a favourable view (b) Wealthy

(c) Shameful