Which of the following induces flowering in long-day plants?

Fruits can be left on the tree longer,so as to increase the market period. This is due to the function of

$A$ : Gibberellic acid increases the yield of malt from barley grain.
$R$ : Gibberellins stimulate the synthesis of amylase,protease and other hydrolytic enzymes for mobilisation of reserve food.

Which phytohormone is useful for leaf expansion in leafy vegetables?

Genetically dwarf plants can be induced to grow tall by using

$A$ genetically dwarf plant can be converted into a tall plant by the use of