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Odsville has five firms - Alfloo, Bzygoo, Czechy, Drjbna and Elavalaki. Each of these firms was founded in some year and also closed down a few years later.

Each firm raised Rs. $1$ crore in its first and last year of existence. The amount each firm raised every year increased until it reached a maximum, and then decreased until the firm closed down. No firm raised the same amount of money in two consecutive years. Each annual increase and decrease was either by Rs. $1$ crore or by Rs. $2$ crores.

The table below provides partial information about the five firms.
\begin{array}{|l|c|c|c||}
\hline \text{Firm} & \text{First year of existence} & \text{Last year of existence} & \text{Total amount raised (Rs. crores)}\\
\hline \text{Alfloo} & 2009 & 2016 & 21 \\
\hline \text{Bzygoo} & 2012 & 2015 &  \\
\hline \text{Czechy} & 2013 & & 9 \\
\hline \text{Drjbna} & 2011 & 2015 & 10 \\
\hline \text{Elavalaki} & 2010 & & 13\\
\hline
\end{array}

For which firm(s) can the amounts raised by them be concluded with certainty in each year?

  1. Only Bzygoo and Czechy and Drjbna
  2. Only Czechy
  3. Only Czechy and Drjbna
  4. Only Drjbna

     

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