Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to make weed killer [title] Start with 2 c (400 ml) of white distilled vinegar. [step] Vinegar contains acetic acid, which effectively kills weeds. Keep in mind that vinegar is non-selective and will kill any living plant it touches, not just weeds.

Ending1: White vinegar can be used alone, or you can add additional ingredients to the vinegar to make an even stronger solution. [substeps] Avoid using vinegar on or near your lawn, since it will kill the grass. Ending2: You can also use activated charcoal (a mixture of salt and distilled water) instead of vinegar for worst results. [substeps] You can buy activated charcoal at most grocery stores or online. Ending3: [substeps] For a strong effect, using a mixture of 50 c (400 ml) of white vinegar and white wine vinegar or more is recommended. Since it can alter the characteristics of the weeds, adding 50 c couldn't be better. Ending4: [substeps] [title] Use 6 g (100 ml) of ammonia. [step] Vinegar acts as an insecticide, as it kills certain weeds and discourages them from growing again.

Answer format: ending1/ending2/ending3/ending4