What two factors will most likely change the speed of a mechanical wave?

Speed of mechanical wave (sound wave) is given by the formula

here we can say that speed of sound wave depends on two factors

1). E = elasticity

2). = density

also we can have the string wave speed given by the equation as

here we can say it will depends on

1). T = tension in the string

2) = linear mass density

Also we will have the speed of sound in gases given as

here it depends on two factors as

1). = Type of gas

2). T = temperature of gas

answer; the correct answer is technician a; ///100%good luck