The internal conflict that is happening in this passage is that the pitcher is battling his weakened arm.
In literature, the term "Internal conflict" is sometimes called the “person vs. self conflict,” because it refers to the conflict that occurs inside a particular character's mind.
Usually, the internal conflict is the conflict that involves a character being faced with a difficult choice.
In the passage, the pitcher arm had turned to jelly(weakens) and wish he could strike the batter out with one more load in his weak arm, with this, the internal conflict that is happening is that pitcher is battling his weakened arm.
Therefore, the Option A is correct.
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