In this sentence Jorge and Manuel are substituted by the personal pronoun 3rd person in plural ellos (they), therefore the conjugation of the verb planchar (to iron) in past tense is:
(ellos) plancharon
Jorge and Manuel ironed the clothes
The other options are incorrect, because:
-The verb Planchimos does not exist in spanish
-Secamos (we dried) is the conjugation of the verb secar (to dry) in past tense with the 1st person in plural nosotros (we) . And as we can see in the sentence, the personal pronoun used is they
- trapearon (mopped) is the conjugation of the verb trapear (to mop) in past tense with the 3rd person in plural ellos/ellas (they), but in this context it does not apply, because here trapear means to scrub the floor with a rag or mop. This is not the right way to treat the clothes
