See the multi-choice question below:

Sentence 1: Additionally, we have not quantified a number of known or suspected health effects linked with PM and ozone for which appropriate concentration-response functions are not available or which do not provide easily interpretable outcomes (i.e.

Sentence 2: The outcomes aren't easy to interpret.

If the first sentence is true, then is the second sentence true?
OPT: (a). yes (b). it is not possible to tell (c). no
(a).