Right answer: Estudiemos
In Spanish, there are three verbal moods: the indicative, the imperative and the subjunctive.
The subjunctive mood is usually used in sentences to express desires, orders, emotion, possibility, judgment, opinion, necessity, or statements that are contrary to facts in the actualities, it is also called the mode of unreality.
Now the Spanish word ojalá is an interjection with which the strong desire for something to happen is denoted, is the hope or the desire of the accomplishment of something.
This description matches with the subjunctive mood, therefore the verb estudiar (to study) must be written in present and subjunctive mood with the 1st person in singular nosotros (we) as estudiemos.
Ojalá que (nosotros) estudiemos ecoturismo
I hope we study ecotourism
Expressing a huge desire, the great hope of studying ecotourism.