A. has thrown ;
Jackson **has thrown **the ball to first base. Therefore, option **A **is correct.
What is the present perfect tense?
When a previous occurrence has **present **repercussions, the present perfect is a grammatical construction that combines the present tense and perfect aspect. Particularly in the context of English grammar, the **phrase **is used to describe forms like "I have finished my work."
To connect events in time, speakers of English utilize the **perfect **tenses (present perfect, present perfect progressive/continuous, past perfect, past **perfect **progressive/continuous, future perfect, and future perfect progressive/continuous).
Will does not use in the present tense, has and have are used in the **present **tense. Thus, Jackson **has thrown **the ball to first base. Therefore, option **A **is correct.
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The correct answer to complete the sentence is option A: 'has thrown.' This choice uses the present perfect tense of the verb 'throw,' which is appropriate for expressing a completed action relevant to the present.
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