Let's define these types of clauses. Adjective clauses can serve as a multi-word adjective, basically. Noun clauses can serve as a multi-word noun, with a subject and verb, but remember, they are still dependent. Adverb clauses start with a subordinating conjunction. Now let's dissect this sentence. 
"It is not right" independent clause
"to make a promise" adjective clause
"unless one is sure he can fulfill the promise" adverb clause
the answer is "one adverb clause and one adjective clause"
        
             
        
        
        
For a more intruiging writing, more interesting for the reader. it creates a better more imaginitive picture for the reader
        
             
        
        
        
The answer to your question is deepest
        
             
        
        
        
15 of the symbols in the preceding pronunciation guide have diacritical marks above them.
        
             
        
        
        
Hi !!
<em>Make the sentence parallel  </em><em>► ANSWER = C</em>
<em />
The teachers like John because he comes to class on time,/ participates in class discussions,/ and submits his assignments before the deadlines.
<em>all  the verbs are conjugated the same way...</em>
<em>-</em>
<em>☺☺☺</em>