Multi-choice problem: Continue writing the next sentence in this paragraph:

A worker removes moss from the top of a roof. another worker

Pick your answer from:
[I] then flies down the capofamiglia wanting to complete a roofed state.;
[II] pushes wet shingles into a raindrop shelter.;
[III] replaces moss with a new one.;
[IV] sprays water all over the roof.;
[IV]