option of d is the write answer
Answer:

Explanation:
A chemical reaction describes the reaction between reactants to produce products.
A chemical equation is represented as a reactant present on the left-hand side of the equation if two or more reactants are present they are separated by the "plus" sign.
On the right side of the equation product is written and if more than one product is formed then these are separated by "plus" sign as in the reactants.
The reactant and the products are separated by an arrow, the head of arrow is in the direction of the product when the reaction is irreversible.
In the case of reversible reactions or chemical reactions that are present in equilibrium, the reactant and product are separated by a double-headed arrow.
Answer:
an accelerant was used because maybe some was spilt and therefore leaving a smell and evidence
Answer:
The nucleus is the most densely compacted part of the atom, it is in the center circled by the electron cloud or shells. It is filled with positively charged protons, and neutrons which have no charge. It is smaller than the electron cloud in size, but in quantity it has more subatomic particles since protons and electrons are equal and the nucleus has nuetrons