Help please if you know Spanish I’ll mark you as brainlister

When we conjugate a verb, we a. change the form of the infinitive b. make it agree with the subject c. indicate the verb tense d. all of the above

Which of the following is not described by gonzalo fernandez de oviedo y valdes in la historian general y natural de las indias

Escoge el verbo correcto. los turistas están hablar en español. aprendiendo haciendo saliendo leyendo