Comparto
The sentence reads: "I [blank] the appetizers."
"Paga" and "Pago" come from the verb pagar which means to pay. This would not make sense in the sentence so you can disregard these choices.
"Comparto" and "Compartes" come from the verb compartir which means to share. This would make sense in the sentence so it will definitely be one of these choices.
To select the correct one, you must determine how to conjugate the verb. The subject of the sentence is "Yo" which means I so you must determine which is the yo form of the verb. "Comparto" is conjugated correctly because the yo ending is -o. "Compartes" is written in the tu (you informal) ending which is incorrect.
The sentence when translated correct is: I share the appetizers.
Hope this helps!!