The correct answer is: D. No error
The sentence “If she will be promoted, she will get a higher salary” is grammatically correct. The verb “will be promoted” is in the future tense, which is appropriate for a conditional sentence. The verb “will get” is also
in the future tense, which is consistent with the first verb. The noun phrase “a higher salary” is the direct object of the verb “will get.”The other options are incorrect because they contain grammatical errors. Option A, “If she will be promoted,” is missing a subject. Option B, “she will get,” is missing a verb. Option C, “A higher salary,” is missing a subject and a verb.