To answer this question, we need to understand the correct verb tense to use in the sentence.
Option A) make - This option is incorrect because "make" is in the present tense, but the sentence requires a past tense verb.
Option B) made - This option is correct. "Made" is the past tense form of the verb "make," which is appropriate for the sentence. It indicates that the invention already happened in the past and made a major contribution to road safety.
Option C) makes - This option is incorrect because "makes" is in the present tense, not the past tense. It does not match the verb tense required by the sentence.
Option D) making - This option is incorrect because "making" is in the present participle form, not the past tense. It does not match the verb tense required by the sentence.
The correct answer is B) made. This option is correct because it is in the past tense, which matches the verb tense required by the sentence.