For a short-circuited transmission line, the reflection coefficient is-

Correct option is B

​$$\textbf{The reflection coefficient } \Gamma \text{ at the load end of a transmission line is given by:} \\\Gamma = \frac{Z_L - Z_0}{Z_L + Z_0} \\[10pt]\text{Where:} \\Z_L = \text{Load impedance} \\Z_0 = \text{Characteristic impedance of the line} \\[10pt]\textbf{For a short-circuited line,} \\Z_L = 0 \\[10pt]\text{Substitute into the formula:} \\\Gamma = \frac{0 - Z_0}{0 + Z_0} = \frac{-Z_0}{Z_0} = -1 \\[10pt]\text{This means the entire wave is reflected \textbf{with a phase reversal} (180\degree\ shift).}$$​​