What conditions cause the contractile vacuole to fill with water?

Under these conditions, water osmosis causes water to accumulate in the cell from the external environment. The contractile vacuole acts as part of a protective mechanism that prevents the cell from absorbing too much water and possibly lysing (rupturing) through excessive internal pressure.

answer; i believe the correct answer is (sporophyte);

i think that it is c, d, and e, hope this