IT IS A AND C.
It is A because every term has a 5 in ones place.
For Example,
5, 45, 445, 4445
And will keep being 5 in the ones place.
It is C because every term has 1 more digit than the previous term.
For Example,
5, 45, 445, 4445
THE NUMBERS I UNDERLINED IS ONE MORE THAN THE PREVIOUS TERM.