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

How to clean aluminum gutters
Lean the ladder against the gutters near a nail.
Locate a place on the gutters where a nail holds them to the house. It is best to place the ladder here because the gutter is supported best at the nails.

Possible answers:
a). There are ways to get the stairs to be straight as well. Find a height of one or two feet to add height..
b). If you place the ladder farther from a nail, the gutter is weaker and may crash. If you can lean the ladder against the house's main structure rather than the gutters, do this to entirely avoid leaning on the gutters..
c). Just test the nail to see what direction it would be best to turn the gutter by squatting on the side where it will not lean heavily. Turn the gutter a few times to remove stubborn bits..
d). Your ladder must be standing higher than the floor when mounting the ladder. Lean on the top of the ladder against the sides of the house to support the ladder..
b).