**Core Concept**
The control and prevention of malaria involve addressing the life cycle of the disease-causing parasite, *Plasmodium spp.*, which requires a specific vector, *Anopheles spp.* mosquitoes, to transmit the infection. The breeding sites of these mosquitoes serve as a crucial factor in the spread of malaria.

**Why the Correct Answer is Right**
Removing breeding places is a fundamental step in malaria control as it targets the source of the vector population. *Anopheles* mosquitoes breed in standing water, which can be found in various locations such as ponds, lakes, and even artificial containers like buckets and flowerpots. By eliminating these breeding sites, the number of mosquitoes can be significantly reduced, thereby decreasing the risk of malaria transmission. This approach is often referred to as the "source reduction" method and is an essential component of integrated vector management (IVM) strategies.

**Why Each Wrong Option is Incorrect**
**Option B:** Full sleeve cloth is a personal protective measure that can prevent mosquito bites but does not address the root cause of malaria transmission, which is the breeding of mosquitoes.
**Option C:** Indoor insecticide can control the mosquito population within a household but is not a sustainable solution to prevent malaria transmission on a larger scale.
**Option D:** Early treatment is crucial for effective malaria management but does not prevent the spread of the disease in the first place.

**Clinical Pearl / High-Yield Fact**
Malaria control measures should always focus on a combination of strategies that target the vector population, including source reduction, larval control, and adult mosquito control, as well as promoting the use of insecticide-treated bed nets and personal protective measures.

**✓ Correct Answer: A. Remove breeding place**