Albuterol Is Useful in the Treatment of Asthma Because It $\alpha_{1}$

Albuterol is useful in the treatment of asthma because it acts as an agonist at which of the following receptors?

A) $\alpha_{1}$ Receptor
B) $\beta_{1}$ Receptor
C) $\beta_{2}$ Receptor
D) Muscarinic receptor
E) Nicotinic receptor