**Core Concept**
The question is testing the understanding of the physiological and pharmacological effects of certain medications on the autonomic nervous system, specifically the use of beta blockers and their effects on heart rate and blood pressure.

**Why the Correct Answer is Right**
Beta blockers, such as propranolol, are non-selective beta blockers that block both beta-1 and beta-2 adrenergic receptors. By blocking beta-1 receptors in the heart, they decrease heart rate and contractility. However, they also block beta-2 receptors in the lungs, which can cause bronchoconstriction and worsen asthma symptoms. This makes option C incorrect.

**Why Each Wrong Option is Incorrect**
**Option A:** This statement is true as beta blockers can be used to treat hypertension by decreasing cardiac output and peripheral resistance.
**Option B:** This statement is true as beta blockers can be used to treat angina by decreasing myocardial oxygen demand.
**Option D:** This statement is true as beta blockers can be used to treat certain arrhythmias by slowing the heart rate.

**Clinical Pearl / High-Yield Fact**
Beta blockers can cause paradoxical bronchospasm, especially in patients with pre-existing asthma or COPD, due to their non-selective blockade of beta-2 receptors.

**Correct Answer:** C. Beta blockers can cause bronchoconstriction and worsen asthma symptoms by blocking beta-2 receptors in the lungs.