Answer:
B
Step-by-step explanation:
"la" in the answer is referring to the salad, so since it's a feminine noun it can't be "los"(masculine) and since the salad is a singular noun, it can't be "las"(plural). Also, if you are using "ustedes"(you guys), you need to say "comen" because "come" is used for "el/ella/usted"(him, her, you). Hope this helps!