Introduction:
Electronic communication refers to the transmission of information or messages through electrical signals. It has become an integral part of our daily lives, enabling us to connect and communicate with others quickly and efficiently. However, there are certain conditions under which electronic communication may not be possible.

Explanation:
The correct answer to the given question is option 'A' - electronic communication is not possible if the message or information is not available in the form of electrical signals. Let's understand why this is the case:

1. Electrical Signals:
Electronic communication relies on the transmission and reception of electrical signals to convey information. These signals can be in the form of voltage variations, electromagnetic waves, or digital data. Before transmitting any message, it needs to be converted into electrical signals to be compatible with electronic communication systems.

2. Availability of Information:
For electronic communication to occur, the message or information must be present in the form of electrical signals. If the information is not available in this format, it cannot be transmitted through electronic means. For example, if the information is in the form of a physical object, such as a handwritten letter or a printed document, it needs to be converted into digital or electronic form before transmission.

3. Limitations of Smell or Touch:
The option 'B' states that electronic communication is not possible if smell or touch is to be transmitted. This is because electronic communication primarily deals with the transmission of visual or auditory information, rather than olfactory (smell) or tactile (touch) information. While there have been advancements in technologies such as virtual reality that simulate touch or smell, these are not typically part of traditional electronic communication systems.

4. Temperature and Humidity:
The options 'C' and 'D' suggest that high temperature or humidity can hinder electronic communication. While extreme environmental conditions can affect the performance or reliability of electronic devices, they do not necessarily render electronic communication impossible. Modern electronic devices are designed to withstand a wide range of temperatures and humidity levels, ensuring their functionality and connectivity in various environments.

Conclusion:
In conclusion, electronic communication is not possible if the message or information is not available in the form of electrical signals. Other factors such as smell, touch, temperature, or humidity may affect the performance of electronic devices, but they do not inherently prevent electronic communication from occurring.