Final answer:
The correct option with the irregular verb in the future tense to complete the sentence is Diré.
Step-by-step explanation:
The correct option with the irregular verb in the future tense to complete the sentence is Diré.
The sentence translates to "I will go on a trip to study endangered turtles."
The verb diré is the first-person singular form of the verb "decir" which means "to say" or "to tell." In this context, it is used to express an action that will happen in the future.
Learn more about Future tense with irregular verbs in Spanish