Correct Answer  Option 3 : 1.0
Formulas for the Coefficients of reflection and refraction are as follows
\({v_{refraction}} = \frac{{2{Z_L}}}{{{Z_L} + {Z_C}}}\)
\({v_{reflection}} = \frac{{{Z_L}  {Z_C}}}{{{Z_L} + {Z_C}}}\)
\({i_{refraction}} = \frac{{2{Z_C}}}{{{Z_L} + {Z_C}}}\)
\({i_{reflection}} = \frac{{{Z_C}  {Z_L}}}{{{Z_L} + {Z_C}}} =  {v_{reflection}}\)
Where, Z_{L }= Load impedance, Z_{C} = Characteristic or Surge impedance of the line.
These coefficients values for open circuit, short circuit, and flat lines are given as

Open circuit line
(Z_{L} = ∞)

Short circuit line
(Z_{L} = 0)

Flat line
(Z_{L} = Z_{C})

v_{refraction}

2

0

1

v_{reflection}

1

1

0

i_{refraction}

0

2

1

i_{reflection}

1

1

0

so, the coefficient of reflection of voltage for a shortcircuited line is: 1