**Core Concept**
The question is testing the understanding of the larval control methods for urban malaria transmission. Urban malaria transmission is primarily due to the presence of Anopheles larvae in standing water, which can be controlled through various methods. The correct answer highlights the importance of cleaning drains, which can harbor mosquito larvae.

**Why the Correct Answer is Right**
Cleaning of drains is an essential larval control method for urban malaria transmission. This is because drains can accumulate water, creating ideal breeding sites for Anopheles mosquitoes. Regular cleaning of drains helps to eliminate these breeding sites, thereby reducing the number of larvae and subsequently the transmission of malaria. This method is particularly effective in urban areas where standing water is often present in drains, cisterns, and other man-made containers.

**Why Each Wrong Option is Incorrect**
**Option A:** Covering overhead tanks is not a larval control method, but rather a way to prevent mosquito breeding in domestic water storage containers.
**Option C:** Filling of ditches and cesspools is a larval control method, but it is not the most effective method for urban malaria transmission. It is more relevant to rural areas where open ditches and cesspools are common.
**Option D:** Uprooting of plants is not a larval control method, and it can even create more breeding sites if the plants are replaced with standing water.

**Clinical Pearl / High-Yield Fact**
It is essential to note that larval control methods should be combined with other measures, such as insecticide-treated bed nets, indoor residual spraying, and case management, to effectively control malaria transmission.

**Correct Answer:**
✓ Correct Answer: B. Cleaning of drains