6345. Even today many people are guided by abstruse moral values.

✅ The correct answer is option B.
Irrational : not logical or reasonable.

Obscure ; not clearly expressed or easily understood.

Impracticable : (of a course of action) impossible in practice to do or carry out.

Dangerous : able or likely to cause harm or injury.

Abstruse : difficult to understand; obscure.

Synonym of Abstruse is Obscure