Answer: Option (1)
Explanation: Chemical weathering refers to the loosening and breaking apart of minerals or particles that are present in the rocks due to the presence of chemical elements. For example, hydrolysis is an example of chemical weathering.
The landform in the above mentioned location appears red because of the of the weathering (chemical) by Oxygen as iron gets oxidized because of the presence of Oxygen and breaks apart forming another mineral.
Thus, the correct answer is option (1).