Multiple choice question, only one choice is right. Please provide brief justification as well, thank you.

(e) Consider the following regression output where the dependent variable is "TestScore" and the two explanatory variables are the student-teacher ratio (STR) and the percent- age of English learners (PctEL): TestScore = 698.9 - 1.10 x STR - 0.650 x PctEL. You are told that the t-statistic on the student-teacher ratio coefficient for a test of significance is 2.56 (in absolute value). The standard error is therefore approximately i. 0.25 ii. 1.96 iii. 0.650 iv. 0.43