Which one of the following is correct ?

Options

A. There is only one Q with `0^(@) lt theta lt 90^(@)` such that `sintheta =a`, where a is a real number
B. There is more than one Q with `0^(@) lt theta lt 90^(@)` such that `sintheta=a`, where a is a real number
C. There is no e with `0^(@) lt theta lt 90^(@)` such that `sintheta =a` where a is a real number
D. There are exactly two `theta`s with `0^(@) lt theta lt 90^(@)` such that `sintheta =a` where a is a real number