Help asap thanks What is an irregular past tense verb?

Verbs which can be placed in the past form simply by adding -ed (for example walk= walked)

Verbs that are placed in the past form simply by adding 'did' (for example watch=did watch)

Verbs with past tense forms that are more 'erratic' for example 'buy=bought'

Which of the following statements is most accurate? a. effective communication skills are not as important as technical skills. b. good communication skills can you in the classroom, on the job, and in your personal life. c. communicating effectively is not related to job success. d. learning to communicate effectively cannot be taught because communication skills are inborn.