Consider the following activities in a building construction: 1. Concreting of roof slabs 2. Brick-jelly lime concrete terracing 3. Erection of form work for slab 4. Construction of parapet wall in terrace The correct sequence of these activities is A. 1, 3, 2, 4 B. 3, 1, 4, 2 C. 3, 1, 2, 4 D. 1, 3, 4, 2

The correct sequence of the activities is:

1. Erection of form work for slab
2. Concreting of roof slabs
3. Brick-jelly lime concrete terracing
4. Construction of parapet wall in terrace

The first step is to erect the form work for the slab. This is a temporary structure that will hold the concrete in place while it sets. Once the form work is in place, the concrete can be poured. After the concrete has set, the form work can be removed.

The next step is to brick-jelly lime concrete terracing. This is a process of laying bricks and then filling the gaps between them with a mixture of jelly lime and concrete. This creates a strong and durable surface that can be used for walking or sitting.

The final step is to construct the parapet wall in terrace. This is a wall that is built around the edge of the terrace to prevent people from falling off. It is usually made of bricks or concrete.

The other options are incorrect because they do not follow the correct sequence of activities. For example, option B suggests that the brick-jelly lime concrete terracing should be done before the concreting of roof slabs. This is not possible because the form work for the slab needs to be in place before the concrete can be poured.