A Stock Is Trading at $20 $- 0.50$ a Decrease of 10 Basis Points in the Interest

A stock is trading at $20. A one-month put with a strike of 19 is valued at $0.360 and has a rho of $- 0.50$ . A decrease of 10 basis points in the interest rate changes the put value by

A) $- 0.005$ .
B) $+ 0.005$ .
C) $- 0.05$
D) $+ 0.0005$ .