Question

the production has been held dash by strikes

Answer 1

The production has been held 'up' by strikes.

Answer 2

Answer :

This question is based on phrasal verbs.

Cambridge English Dictionary defines 'phrasal verb' as 'a combination of a verb and an adverb or a verb and a preposition, or both, in which the combination has a meaning different from the meaning of the words considered separately.'

'Hold up' is a phrasal verb, which according to the Cambridge English Dictionary, means 'to cause a delay for someone or something, or to make them late.'

So, the correct sentence is :

The production has been held up by strikes.