An unknown alkene $(A)$ reacts with $3 \ mole$ of $H_2$ gas in the presence of a platinum catalyst to form $1$-isopropyl-$4$-methylcyclohexane. When the unknown alkene $(A)$ is ozonized and reduced,the following products are obtained:
$HCHO$,$OHC-CH_2-CO-CO-CH_3$,and $CH_3-CO-CH_2-CHO$
What is the structure of alkene $(A)$?

• A
  Limonene ($1$-methyl$-4-$(prop$-1-$en$-2-$yl)cyclohex$-1-$ene)
• B
  $1-$methyl$-4-$(prop$-1-$en$-2-$yl)cyclohex$-1,3-$diene
• C
  $1-$isopropylidene$-4-$methylcyclohexa$-2,5-$diene
• D
  $4-$methylene$-1-$(prop$-1-$en$-2-$yl)cyclohex$-1-$ene