Answer:
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First of all, it's important to note whether the sentence is referring to plural or singular noun. It mentions "los tratamientos", therefore it is plural which eliminates A and B.
Second of all, the phrase "es dudoso que..." is commonly associated with subjunctive. Curar is the original form of the word which in subjunctive changes ar to er tenses.
Therefore your answer is C. curen because it is both subjunctive and plural
I would say D
Soy Patricia. Me gusta cocinar en la celebración del Día de la Madre
Sí a fun mamá le gustan el pescado y el pastel que Covina’s en el horno.
false. in the second sentence it states that he has a ton of homework. hope this helps bebe :)