Explanation
Correct answer: C.
Choice C is the best answer. The convention being tested is the use of verb forms within a sentence. The sentence’s subject is “a unique tradition of embroidery,” and its finite main verb is “remains.” This choice correctly uses the nonfinite present participle “dating” to form an integrated participial phrase (“dating...years”) that modifies the subject, providing additional information about how far back the tradition goes.
Why the other choices are wrong
Choice A
Choice A is incorrect because it results in an ungrammatical sentence. Using the finite present tense verb “dates” creates a second finite verb in the main clause, which already has the finite verb “remains” as its main verb.
Choice B
Choice B is incorrect because it results in an ungrammatical sentence. Using the finite present tense verb “date” creates a second finite verb in the main clause, which already has the finite verb “remains” as its main verb. Furthermore, the plural verb “date” doesn’t agree in number with the singular subject, “a unique tradition of embroidery.”
Choice D
Choice D is incorrect because it results in an ungrammatical sentence. Using the finite present perfect tense verb “has dated” creates a second finite verb in the main clause, which already has the finite verb “remains” as its main verb.