Help I’m doing an exam and I don’t get this :(

Fill the blank with a la, a los, a las, or al. los alumnos .

Which one of the following is the correct rhyme to keep in mind when using the spanish counterparts to this, that, those and these? a: “that” and “those” both have s’s, “this” and “these” don’t b: “that” and “those” both have t’s, “this” and “these” don’t c: “this” and “these” both have s’s, “that” and “those” don’t d: “this” and “these” both have t’s, “that” and “those” don’t

5to get 12 ngwr klg wknwk vnw vnw vnw gw igh pighwe pgiqe pghw pighw