To understand which statements are true according to Section 29 of the Right of Children to Free and Compulsory Education (RTE) Act, it is important to comprehend the educational philosophy and practices encouraged by this law.

Section 29 of the RTE Act: This section outlines the curriculum and evaluation procedure concerning the educational process. It emphasizes fostering a child-centric and activity-based learning environment, integrating the teaching process with discovery and exploration, and encouraging education in the child's mother tongue.

Let's evaluate each statement:

1. Statement A: Section 29 of the RTE Act indicates teaching learning through activities. 
   This is correct since Section 29 encourages activity-based learning which is crucial for child-centered education.
2. Statement B: Section 29 of the RTE Act indicates teaching learning through project method only. 
   This is incorrect. While the project method may be a part of the teaching approach under activity-based learning, the act does not restrict to project method only.
3. Statement C: Section 29 of the RTE Act indicates teaching learning through discovery. 
   This is correct. The emphasis on child-led exploration and discovery is a key component of the RTE Act.
4. Statement D: Section 29 of the RTE Act indicates teaching learning through exploration. 
   This is correct. Along with discovery, exploration is encouraged to stimulate curiosity and active learning.
5. Statement E: Section 29 of the RTE Act suggests teaching learning in mother tongue. 
   This is correct. The act promotes education in the child's mother tongue, as it supports better understanding and cognitive development.

Given the analysis above, the correct combination of true statements is:

C, D, E, A only

This aligns with the option: C, D, E, A only