All the choices are incorect

Master-Detail Relationship Fields, per Object (Standard or Custom) --> 2

Total Relationship Fields (Master-Detail + Lookup), per Object (Standard or Custom) --> 40

Its Like,

==> 38 Lookup and 2 MD

==> 39 Lookup and 1 MD relationship fields on an object

Please check this link :

https://success.salesforce.com/answers?id=9063A000000DYD0QAO

By default, the system is limited to 40 lookup fields per object, up to two of which may be master-detail relationships if it is a custom object. You can request more than the 40 relationship per object limit if absolutely necessary, although there are performance implications for doing so.

SM answer is correct but option are not available

Maximum is 40 look up relationships per object.
and 2 master-detail relationship per object.
If an object already has 2 master-detail relationship, then max look-up relationships are 38.